LIFE SAVER DUDE. I'm not familiar with wells. From my other research it looked like I needed a new well. I tested my pressure as a long shot and this video just saved me from thousands of dollars that wouldn't fix my problem. I might need a new tank, but that isn't terrible. So far it's holding air. But it's old.
Well done Ben. 1st video I looked at and you explained the pressure setting for the pressure tank clearly. My tank pressure was down to 15psi and the pump cycling. Set it to the pressure per your instructions and all looks good now. Thanks
You might want to just set it up so that if you want to drain your pressure tank you have a pipe that simply runs out through the wall and drains it outside. That's what I would do, of course I'm here in West Texas, it may be warmer here than where you are. Thanks so much for the video! It was very helpful.
Always, always Benjamin...the best camera work and very informative without taking sooo much time to say it. Lol. What brand pump and tank do you have...the sizes and such. That would be useful for me. Thanks for your help...I don't know how many times now. I like your style of no nonsense and neat work. Jesus bless.
NIce job! I subscribed, hit the like and bell. At risk of sounding like an old fart, I have to say I love to see smart, well spoken, young people thriving in a blue collar career (like generations of my family) ready to help others learn how to do this or that as well. You will never be unemployed and probably already running your own business. You answered all the questions I had about pump tanks. I needed a refresher before I go adjust my son's house's well tank later today. I could not remember what the deal was with the 2 lb differential. All the best to you, Ben.
Me too, and everything you said. I have a blue collar daughter and one who loves physical work, she could watch it all day! Lol! We know which one would be good in a disaster situation. Luv 'em both, but...,
A very valuable addition to any well pump system is an electric light bulb placed somewhere outside the well house that comes on when the pump turns on. I just use a 14-2 romex feeding the exterior rated light fixture. I connect one of the 14-2 wires inside the pressure switch to one of the two pump/load terminals and the other simply grounded to one of the ground screws of the pressure switch housing. At the light fixturre, just connect the two wires as usual. Now, any time the pump comes on, there's a visual alert that can be seen from anywhere outside the well house as long as the pump is running.
Great video, so many idiots set the tank when empty to the line pressure desired. Which is 100% wrong. It should be about half of your desired pressure to prevent early bladder failure.
I wonder if you could help me find answers to the following: Thinking to lower the pressure tank and connect to the pump about 10' - 15' under the ground to eliminate the heating well house in the winter season. My pipe runs about 6' under the ground. 1) is it a good idea? 2) how to do it? 3) Should I install another pressure tank under the house in the crawl space? The well is about 30 yards away from the house.
May I ask... I have a 44 gallon well X Trol tank with a 60/80 pressure switch, that I have set to 55/75 for maximum pressure at my bathrooms, but not hitting the 80lb max, that home piping is rated for. So with that set up, what should be the air pressure in my water tank itself in order to maximize the house water pressure? If I understood your video right, I need to get it to 53 pounds of pressure inside the tank, correct? Thanks in advance for your response back and thanks for the great vid. Edit to add another question... Can I drop my pressure switch down to 45psi, so that the settings will be 45/75? My thinking is, if I drop the low down from 55 to 45, I'll still have solid pressure, but I am extending my well pump life by a lot, because it will comes on less, and stay on longer when it does come on. I think these questions will help a lot of people, and if they do, please watch the video, but also watch the ads. Sit through the ads no matter how painful, as they get the great people who create awesome vids like this paid a little bit. JS. 😊 TY Benjamin! 👍
Question: what does the tank do if the bladder pressure gets too low? what about too high? Are there symptoms one can detect while, say, taking a shower?
At 1:40 , when showing that you have to empty the water from the pressure tank, you say "You can do this any place in your house." My tank is 2" above the floor in my basement, so would your statement mean that I could turn on the water in the (basement) laundry tub to empty the tank? I suppose if I do that first, then I could empty the last little bit of water from the hose bib plumbed in right next to the pressure tank to completely empty it. Did I understand you correctly and it my procedure adequate?
.Great video , I will use these tips to analyze whats with the well pump. On another job site last time I messed with the the sprinkler system box next to the well pump it started to smoke a little, then a lot, then a few small flames, I freaked out !! Thankfully the gardner next door saw me getting a little hysterical. by then it was kind of on fire ! we had to call the electrician to rewire the yard, omg it was something . WHAT A DAY! lol One question, Why are you standing in a puddle of water with 220volts running through the system. Be careful ! I subscribed please make more videos !
Great info. Thanks. Do you have any thoughts on Cycle Stop Valves? They sound good on paper but wondering if you have experience with them and could discuss pros/cons
I have recently watched probably 6-8 videos with folks troubleshooting pump/pressure switch/pressure tank issues. Not 1 has mentioned anything about the tube that runs from the pump to the switch. I'm in Florida and every one of them I've seen are plastic. We have a fairly serious sulfur content (NEW WELL) and the darn sulfur has clogged up the jet in the pump twice now in 2 years to the point that mechanical intervention and even flushing with muriatic acid has to be done in order to get it to pump water again. Have you ever dealt with something like this?
Great helpful video Benjamin. I have a question. LG told me that my ice maker is not working properly because the water pressure is too high. I don't know if that's correct but I'm wondering how to permanently lower the pressure in my tank. It's now set at 40-60. Can I change it to 30-50? How do I do that? I'm assuming I let some air out of the tank to lower the cut-in number to 28. How do I adjust the pressure switch? Thanks for your help
This depends on the type of your pressure tank. However in my experience with modern pressure tanks, first check the ratings for your individual tank. It should be printed clearly on a label somewhere on the tank. Didn’t see the specs on that particular pressure tank. But that’s an incredibly low water pressure. Standard residential is 60 psi in most areas. And you don’t want to go beyond about 75 or 80 for any reason for residential water. Specs on that particular tank will probably tell you’ve got a max pressure Capability of 125 psi. Of course that may not do much good if you have pressure reduced at the well. And as always, if it was configured based on the capacity or capability of your well then it should be left at those settings. There’s absolutely so much to get into on this subject there’s no way to do it in a single comment. If you’re having trouble with your water pressure, first you should check the pressure regulator on your well, and consider bringing that tank up to 60 psi if it can handle it. It very likely can handle that.
I have a small floater which just runs my sprinklers. I noticed at any given time the pump would come on for about 2 maybe 3 seconds and just stop again every so often. Not sure if the tank was just so low on pressure. Now the pump doesn't come on when activated my the sprinkler panel. I took a tire gauge to check tank I get a 0 psi reading
Hi, greetings from Sri Lanka. Thanks for this very useful video. I am still learning. Recently my pressure pump for the bathroom showers started to drop pressure and as result the water flow gets really slow and only a while the pressure pump restarts. I checked the pressure gauge and find the pump restarts only when the pressure goes down to zero. Could you pl advice me to correct this, which nuts to adjust in the pressure switch? Thanks again.
Hey Ben first of all when I thank you for sharing your knowledge and wisdom I was wondering maybe if you you can help me figure out the layout and set up of my components. I have a water storage tank from a well system so it goes like this well to storage tank storage tank to house, and my components I would like to have your wisdom on how to set up in the order would be a settlement spin down filter to my Grundfos booster pump expansion tank whole house filtration system and I have a electric tankless hot water heater so if it’s not much to ask from you, could you please help me with the set up and configuration just wondering if the order in my head matches up with how you would set it up I thank you very much for any feedback. God bless Ben be safe.
You have have already started to answer questions anyway pressure take started leaking went to the hardware store not knowing anything I took his advice and got a 30 gallon tank witch the one I took out 75 gallon now I have to much air in the system what can you offer me help on Thank you
Hi guys! I'll be available throughout the day to answer questions here in the comments and will be on live at 6:30pm Central time when this video goes live. Would love to hear from you if you're available at that time!
you gave me anxiety being in water with electrical and piping ive been electrocuted by an exposed wire hitting a window frame and me grabbing the the window to open it. i had to be kicked off the window. other than that it was educational video. summed everything up nicely. just be safer.
Holy shit... My pump went from going on.off.on.off.on.off. to On........... Off................................................................. On.......... you get the point.. Can't believe i didnt know to check these yearly
You should explain WHY short cycling over time damages a pump. I assume it's because a pump draws much higher amperage at startup, which heats the pump above normal running temperature, and short-cycling doesn't give the pump enough run time to cool it down to normal running temperature.
Starting and stopping more often subjects the well to increased wear from acceleration and deceleration. Just as a city driven car has more wear than a highway driven car of the same mileage.
When on a well what determines the overall water pressure? My pressure tank is set to fill at 40 and stop at 50 psi, and my water pressure after the tank is 45 psi. Is there anyway to safely increase this?
I'm sure glad you are a professional at this. My goodness, you're standing in a pit with water and there is electrical boxes and breakers all around you. Yikes! Be careful my friend.
Hi Ben - great video - thanks! I would like to adjust my pressure tank so that i can allow my pump to generate more pressure. Does that mean I simply need to a) empty the tank of water; b) pump more air into the tank...? The pump is 380 watts and currently is set to shut off at 43 psi. I want it to push until it hits 59 psi. Is the pressure tank the LIMITING FACTOR in this setup? Thanks again!
It's all just an open space. If you decrease the air pressure, you'll have less water in the tank, but the water will get to the same pressure. You can't get more pressure than your pump can produce.
If your system is set up correctly, your pump was sized according to its pump curve and the max amount of water it can pump out of your well at a given pressure range like 20-40, 30-50, 40-60psi. You can't just soup up your pump pressure to get more water. If that forces your pump on the high end of it's pump curve, you can wear it out prematurely.
Do I have to drain the water to add air. My 40/60 is reading 1 psi and I just drained it my pressureguage is broken . And the problem I have is high and low water pressure.
So can you put air in the tank with a compressor? I have a 20 40 wellsaver pressure tank, it has twenty lbs when we checked the valve, but our PSI valve is at 0.
You are describing a cycling pump. The switch is being activated and causing the pump to turn on & off rapidly (every few seconds) and as Ben explained, this is likely due to the pressure tank having low pressure. If you watch your pressure gauge you'll see it going up & down with the cycling.
Finally...a video about Well Pumps I can actually understand. ..Thank you for posting this
LIFE SAVER DUDE. I'm not familiar with wells. From my other research it looked like I needed a new well. I tested my pressure as a long shot and this video just saved me from thousands of dollars that wouldn't fix my problem. I might need a new tank, but that isn't terrible. So far it's holding air. But it's old.
Finally someone explains this in an understandable way! Good on you.
Great video, straightforward common-sense approach for how the system works, thanks for doing this.
Ben you're a jack of all trades
AC, electrical, plumbing
Well done Ben. 1st video I looked at and you explained the pressure setting for the pressure tank clearly. My tank pressure was down to 15psi and the pump cycling. Set it to the pressure per your instructions and all looks good now. Thanks
awesome VIDEO . I have to
check my pressure tank . it
was installed a year ago .
You might want to just set it up so that if you want to drain your pressure tank you have a pipe that simply runs out through the wall and drains it outside. That's what I would do, of course I'm here in West Texas, it may be warmer here than where you are. Thanks so much for the video! It was very helpful.
I have been looking for a video just like this and you nailed the answer right on the money.
Your a knowledgeable and gifted teacher
Always, always Benjamin...the best camera work and very informative without taking sooo much time to say it. Lol.
What brand pump and tank do you have...the sizes and such. That would be useful for me.
Thanks for your help...I don't know how many times now. I like your style of no nonsense and neat work. Jesus bless.
Thanks Ben! You really helped us with setting up our pressure tank with your detailed info.
Thank you!
The last time I checked my pressure tank was like 7 years ago.😂
Best video I have seen on the topic. Clear and concise. Thank you.
NIce job! I subscribed, hit the like and bell. At risk of sounding like an old fart, I have to say I love to see smart, well spoken, young people thriving in a blue collar career (like generations of my family) ready to help others learn how to do this or that as well. You will never be unemployed and probably already running your own business. You answered all the questions I had about pump tanks. I needed a refresher before I go adjust my son's house's well tank later today. I could not remember what the deal was with the 2 lb differential. All the best to you, Ben.
Me too, and everything you said. I have a blue collar daughter and one who loves physical work, she could watch it all day! Lol! We know which one would be good in a disaster situation. Luv 'em both, but...,
Your videos are so clear and detailed, I was able to see your individual DNA molecules in your hands of those close up shots.
i was told 2lbs below pump kick in pressure with system depressurized .good video ! ben !!
A very valuable addition to any well pump system is an electric light bulb placed somewhere outside the well house that comes on when the pump turns on. I just use a 14-2 romex feeding the exterior rated light fixture. I connect one of the 14-2 wires inside the pressure switch to one of the two pump/load terminals and the other simply grounded to one of the ground screws of the pressure switch housing. At the light fixturre, just connect the two wires as usual. Now, any time the pump comes on, there's a visual alert that can be seen from anywhere outside the well house as long as the pump is running.
Great, great video. Clear easy to understand explanation Ben.
Great video, so many idiots set the tank when empty to the line pressure desired. Which is 100% wrong. It should be about half of your desired pressure to prevent early bladder failure.
Exactly what I was after. Well done!
Sir... u jus solved alll my problems. I changed all my lines n taps bcuz my pump wz coming on n off every 2 mins.
The most knowledgeble young guy in the internet, rare for new generations
Fck off with your generation crap.
Thank you for this Video. It was easy to understand. Really appreciate the help.
That valve is called a Schrader valve.
WHAT determines which pressure setting 30-50 or 20-40 is chosen Benjamin ????
Great video!
Very Helpful, Thank You
Oh mygosh , I havent checked tank pressure in the 23 years i've lived here, but you're right not enough tank pressure. I do remember Eddy Haskell.
I wonder if you could help me find answers to the following:
Thinking to lower the pressure tank and connect to the pump about 10' - 15' under the ground to eliminate the heating well house in the winter season. My pipe runs about 6' under the ground. 1) is it a good idea? 2) how to do it? 3) Should I install another pressure tank under the house in the crawl space? The well is about 30 yards away from the house.
excellent explanation
Very good explanation bro.
Thanks.
Great video man thanks a lot. I appreciate it.
ben your videos are awesome. thank you
Thanks what I was looking for on pressurizing the tank, but has anyone told you you look like leave it to beaver?
Great information. My jet pump is short cycling. Should I install a larger pressure tank?
No, firat check if the bladder of your pressure tank is spoiled. This causes the pressure tank to become water-logged resulting in short cycling.
When draining the tank do you close off the valve going to the rest of the house or do you let it all drain back into the sump area?
May I ask...
I have a 44 gallon well X Trol tank with a 60/80 pressure switch, that I have set to 55/75 for maximum pressure at my bathrooms, but not hitting the 80lb max, that home piping is rated for.
So with that set up, what should be the air pressure in my water tank itself in order to maximize the house water pressure?
If I understood your video right, I need to get it to 53 pounds of pressure inside the tank, correct?
Thanks in advance for your response back and thanks for the great vid.
Edit to add another question...
Can I drop my pressure switch down to 45psi, so that the settings will be 45/75? My thinking is, if I drop the low down from 55 to 45, I'll still have solid pressure, but I am extending my well pump life by a lot, because it will comes on less, and stay on longer when it does come on.
I think these questions will help a lot of people, and if they do, please watch the video, but also watch the ads. Sit through the ads no matter how painful, as they get the great people who create awesome vids like this paid a little bit. JS. 😊
TY Benjamin! 👍
Question: what does the tank do if the bladder pressure gets too low? what about too high? Are there symptoms one can detect while, say, taking a shower?
thanks for the informative video.
Thanks for the information and in a simple way that makes it easy to follow.
Told me everything I needed to know. Thank you
thank you for the video, it's helpful
At 1:40 , when showing that you have to empty the water from the pressure tank, you say "You can do this any place in your house." My tank is 2" above the floor in my basement, so would your statement mean that I could turn on the water in the (basement) laundry tub to empty the tank? I suppose if I do that first, then I could empty the last little bit of water from the hose bib plumbed in right next to the pressure tank to completely empty it. Did I understand you correctly and it my procedure adequate?
.Great video , I will use these tips to analyze whats with the well pump.
On another job site last time I messed with the the sprinkler system box next to the well pump it started to smoke a little, then a lot, then a few small flames, I freaked out !! Thankfully the gardner next door saw me getting a little hysterical. by then it was kind of on fire !
we had to call the electrician to rewire the yard, omg it was something . WHAT A DAY! lol
One question, Why are you standing in a puddle of water with 220volts running through the system. Be careful ! I subscribed please make more videos !
Great info. Thanks.
Do you have any thoughts on Cycle Stop Valves? They sound good on paper but wondering if you have experience with them and could discuss pros/cons
Will you do a install video on the same tank?
I have recently watched probably 6-8 videos with folks troubleshooting pump/pressure switch/pressure tank issues. Not 1 has mentioned anything about the tube that runs from the pump to the switch. I'm in Florida and every one of them I've seen are plastic. We have a fairly serious sulfur content (NEW WELL) and the darn sulfur has clogged up the jet in the pump twice now in 2 years to the point that mechanical intervention and even flushing with muriatic acid has to be done in order to get it to pump water again. Have you ever dealt with something like this?
Thanks saved me from calling a plumber on my handyman service call that I couldn't figure out for anything 😄
Great video. Very helpful.
Great helpful video Benjamin. I have a question. LG told me that my ice maker is not working properly because the water pressure is too high. I don't know if that's correct but I'm wondering how to permanently lower the pressure in my tank. It's now set at 40-60. Can I change it to 30-50? How do I do that? I'm assuming I let some air out of the tank to lower the cut-in number to 28. How do I adjust the pressure switch?
Thanks for your help
This depends on the type of your pressure tank. However in my experience with modern pressure tanks, first check the ratings for your individual tank. It should be printed clearly on a label somewhere on the tank.
Didn’t see the specs on that particular pressure tank. But that’s an incredibly low water pressure. Standard residential is 60 psi in most areas. And you don’t want to go beyond about 75 or 80 for any reason for residential water. Specs on that particular tank will probably tell you’ve got a max pressure Capability of 125 psi. Of course that may not do much good if you have pressure reduced at the well.
And as always, if it was configured based on the capacity or capability of your well then it should be left at those settings. There’s absolutely so much to get into on this subject there’s no way to do it in a single comment. If you’re having trouble with your water pressure, first you should check the pressure regulator on your well, and consider bringing that tank up to 60 psi if it can handle it. It very likely can handle that.
Of course you need to be sure your well pump is rated for those pressures. A few of them simply are not. But most can
Winter i really have to keep a eye for busted lines! Boy does that run up the electric bill FAST> Plus it not good on the well pump either
Thanks Benjamin, my 40/60 tank is reading at 40 psi, is this bad? I know it shouldn’t be 38
Very nice video and well explained. Thanks
Good video bro, you look alot like Leave it to Beaver
Are you supposed to close the water faucets when pressurizing the tank?
I have a small floater which just runs my sprinklers. I noticed at any given time the pump would come on for about 2 maybe 3 seconds and just stop again every so often. Not sure if the tank was just so low on pressure. Now the pump doesn't come on when activated my the sprinkler panel. I took a tire gauge to check tank I get a 0 psi reading
Great job on the explanation
While you are doing all this, do you also need to shut the water intake to the water heater so that it doesn’t go dry?
Hi, greetings from Sri Lanka. Thanks for this very useful video. I am still learning. Recently my pressure pump for the bathroom showers started to drop pressure and as result the water flow gets really slow and only a while the pressure pump restarts. I checked the pressure gauge and find the pump restarts only when the pressure goes down to zero. Could you pl advice me to correct this, which nuts to adjust in the pressure switch? Thanks again.
great info, thank-you
Thanks man u saved me allot of bs here in southern Oregon
Hey Ben first of all when I thank you for sharing your knowledge and wisdom I was wondering maybe if you you can help me figure out the layout and set up of my components. I have a water storage tank from a well system so it goes like this well to storage tank storage tank to house, and my components I would like to have your wisdom on how to set up in the order would be a settlement spin down filter to my Grundfos booster pump expansion tank whole house filtration system and I have a electric tankless hot water heater so if it’s not much to ask from you, could you please help me with the set up and configuration just wondering if the order in my head matches up with how you would set it up I thank you very much for any feedback. God bless Ben be safe.
Very helpful
Nice information bro.Thank you.
What about a pressure tank in the hot sun? Will that affect the number. Benjamin Sahlstrom
Thanks for the video =)
You have have already started to answer questions anyway pressure take started leaking went to the hardware store not knowing anything I took his advice and got a 30 gallon tank witch the one I took out 75 gallon now I have to much air in the system what can you offer me help on
Thank you
Great information there bro , thanks very well explained
DO YOU HAVE TO CHANGE THE TANK AND HOW OFTEN DO U CHANGE IT. HOW LONG WILL IT LAST. WHAT DO U DO WITH THE TANK AFTER. COULD IT BE SOLD BACK.
Nice informative video man!
Thank you
Hi guys! I'll be available throughout the day to answer questions here in the comments and will be on live at 6:30pm Central time when this video goes live. Would love to hear from you if you're available at that time!
What about a pressure tank in the hot sun? Will that affect the number
you gave me anxiety being in water with electrical and piping ive been electrocuted by an exposed wire hitting a window frame and me grabbing the the window to open it. i had to be kicked off the window. other than that it was educational video. summed everything up nicely. just be safer.
My faucets in the house spit out water when the faucets are turned on . Could this be a problem with the pressure not being set correctly in the tank?
Holy shit... My pump went from going on.off.on.off.on.off. to On........... Off................................................................. On.......... you get the point.. Can't believe i didnt know to check these yearly
And also does it matter the size of tank , as a rule is the pressure all ways te lowest number of the switch as a pressure #number, thanks again 👍
Hello friend how many psi of pressure should I put to my 4 gallon well thank. Thanks
You should explain WHY short cycling over time damages a pump.
I assume it's because a pump draws much higher amperage at startup, which heats the pump above normal running temperature, and short-cycling doesn't give the pump enough run time to cool it down to normal running temperature.
Starting and stopping more often subjects the well to increased wear from acceleration and deceleration. Just as a city driven car has more wear than a highway driven car of the same mileage.
When on a well what determines the overall water pressure? My pressure tank is set to fill at 40 and stop at 50 psi, and my water pressure after the tank is 45 psi. Is there anyway to safely increase this?
If you add a second tank, does it have to be the same size as the first one?
Good video
Hi Ben, I don't mean to be rude, but has anyone ever told you you look the The Beaver on "Leave it to Beaver"
Thanks!
I just checked my pressure tank and water came out of the valve, it should read 28. It reads around 50, what might have happened? Thx
What happens if you set the pressure in the tank the same as the cut in pressure ?
I'm sure glad you are a professional at this. My goodness, you're standing in a pit with water and there is electrical boxes and breakers all around you. Yikes! Be careful my friend.
Hi Ben - great video - thanks! I would like to adjust my pressure tank so that i can allow my pump to generate more pressure. Does that mean I simply need to a) empty the tank of water; b) pump more air into the tank...? The pump is 380 watts and currently is set to shut off at 43 psi. I want it to push until it hits 59 psi. Is the pressure tank the LIMITING FACTOR in this setup? Thanks again!
It's all just an open space. If you decrease the air pressure, you'll have less water in the tank, but the water will get to the same pressure. You can't get more pressure than your pump can produce.
If your system is set up correctly, your pump was sized according to its pump curve and the max amount of water it can pump out of your well at a given pressure range like 20-40, 30-50, 40-60psi. You can't just soup up your pump pressure to get more water. If that forces your pump on the high end of it's pump curve, you can wear it out prematurely.
I'm
Thank you.
Do I have to drain the water to add air. My 40/60 is reading 1 psi and I just drained it my pressureguage is broken . And the problem I have is high and low water pressure.
Are different tanks require different pressures?
After 2 weeks of having my sense device it let me know my well pump was short stoping. Turned out to be a bad tank.
So can you put air in the tank with a compressor? I have a 20 40 wellsaver pressure tank, it has twenty lbs when we checked the valve, but our PSI valve is at 0.
Does it matter what side of the tee you put your pressure gauges and pressures relief valve
If the tank is low or not working properly, will the pressure switch turn off and on rapidly?? Thank you very much
You are describing a cycling pump. The switch is being activated and causing the pump to turn on & off rapidly (every few seconds) and as Ben explained, this is likely due to the pressure tank having low pressure. If you watch your pressure gauge you'll see it going up & down with the cycling.
Anyone remember leave it to beaver
😂😂😂
Jesus... 😆
Gee golly, Wally!
Pretty close my friend.
The Beave was never this helpful
😂😂😂😂😂
Hello Ben from Chile.
I have a water tank problem.
Would you be willing to talk to me to give me your advice on my Tank problem>
Thanks. Jim in Chile
my tanker has the rubber insert where you put air the rubber is leaking how can I replace it ?
And Jerry Mathers as The Beaver....
His brother
So my water outlate have 50 psi what is pressure switch should I get and do I have put more air in tank till it's reach 50 psi air in it?