You don't say what model trailer you have????? Do you have two toilets???? If you do , the half bath may share toilet and sink to one tank. And it may not have a roof vent (although it should) and the "cheater vent" only releases negative pressure, not the positive pressure from the city water. You may also have another pull handle that you are not aware of. 
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 Hank & Lynn
2007 Cougar 290RKS, E-Z Flex, 16" XPS RIBs ( SOLD  .. Gonna miss her ... looking for new 5r)
2004.5 Dodge 2500 QC, LB, 5.9HO, WestTach gauges, Ride-Rite
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