Isolation Valve Kit for Tankless Water Heater

What are isolation valves and what do they do..

[@adamr1637]

Great video--This channel is the equivalent of an apprenticeship!

[@rons8098]

Excellent explanation of the valve assemblies!

[@mrsmctier]

I cannot turn the small valve to closed. It won’t move. What do I do to get it to shut? This is the valve that has the pipe cover for servicing, I assume.

[@PlumbingSolutionsLLC]

They do that over time, I use a pair of pliers to break it free. once you get it moving it should work fine.

[@beechnut9455]

What isthat dual valve piece called?