This is called a back check valve.
Rv hot water heater bypass valve diagram.
With the system clear of water remove the air compressor and head to the water heater s bypass valve locations vary.
As the water warms it rises to the top of the tank.
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The next case is one is which you have a valve on the cold water line and a bypass valve in the middle but there is no valve on the hot water line.
Now go into your rv and find the heater from the inside.
When the by pass system is used it takes the cold water going.
If you look at the rv plumbing diagram it can be placed anywhere on the hot orange or cold blue lines.
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.
You may need to remove a cover to access it.
There are numerous configurations of the water heater bypass operation.
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The object is the same to prevent filling your water heater with rv antifreeze.
What you will see instead of a valve is a brass fitting at the hot water outlet on the water heater.
The water heater by pass system is used to separate the water heater from the rv s plumbing system.
As water is pushed through the water lines some of that water is forced into the water heater s tank.
Cold water comes in at the bottom and hot water comes out of the top of the heater.
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