Cold water comes in at the bottom and hot water comes out of the top of the heater.
Rv hot water heater bypass two valve diagram.
This is called a back check valve.
Now go into your rv and find the heater from the inside.
You may need to remove a cover to access it.
What you will see instead of a valve is a brass fitting at the hot water outlet on the water heater.
If your rv has a bypass valve these two pipes will be connected directly to each other using a third pipe.
Most rv manufactures today install water heater by pass systems on the rvs they sell.
The water heater by pass system is used to separate the water heater from the rv s plumbing system.