Sorry champ, but I don't think you understand how a hose barb works....🤣 The smaller fitting is the correct size, put the tube in some hot water for a couple of minutes to soften up, then force it over the end of the hose barb. The inside diameter of the hose barb should be the same or slightly bigger than the inside diameter of the tube. The stretch of the tube over the outside of the hose barb is what holds it on without a clamp. You may also find it helps to put the hose barb in the freezer overnight to shrink it in size, then heat your tube and jam it on quick.
Sorry champ, but I don't think you understand how a hose barb works....🤣
The smaller fitting is the correct size, put the tube in some hot water for a couple of minutes to soften up, then force it over the end of the hose barb. The inside diameter of the hose barb should be the same or slightly bigger than the inside diameter of the tube. The stretch of the tube over the outside of the hose barb is what holds it on without a clamp. You may also find it helps to put the hose barb in the freezer overnight to shrink it in size, then heat your tube and jam it on quick.
I used barb fittings never had to heat it up just a bit of force