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Old 09-28-2018, 12:35 PM   #20
wingnut60
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Join Date: Sep 2005
Location: Where we park it
Posts: 2,838
If you are asking about the item in the pic with the 'what is this' arrow--it is a mixing valve. Sometimes, the water heaters provide water that is too hot, and the valve is used to add some cold water to the hot water when in use.
Or, since I can't see the rest of the line directions, could be a bypass valve to winterize the trailer without going thru the water heater.
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