The trailer should come to you winterized with antifreeze in all the lines. You should be able to use the antifreeze bypass kit and pressurize the system with the hose in a gallon jug of antifreeze. If you leave the pump on, if it cycles, something leaks somewhere, if it doesn't cycle, then you're pretty safe in thinking no leaks from the city water input throughout the pressurized part of the system. All that wouldn't be checked that way would be the 2 fittings on the hot water heater, the outside shower hose/wand fitting and the water tank/supply line up to the pump.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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