our old trailer only had 1 valve as well. all it needs to do is connect the cold in and hot out to bypass the heater, it works. remove the anode rod from water heater, leave out till spring. Locate your water pump and look for hose coming into pump from potable tank, is there a Y or valve at that point or one nearby? A short piece of hose with an open end not connected to anything? that is probably meant to be inserted into a jug of anti freeze! Failing to have a permanent winterization valve(s) installed you will need to manually remove the pump inlet hose and install a temp suction hose. hope this helps.
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