I think there a screw valve on the outside(removable vent)
That might be the trouble.
When winterizing you shut that valve.
It was off when I received my camper.
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2007 Fun Finder 189fbs Scrapped 4/16
2006 Hummer H3 1983 Honda CX650C
1968 Oldsmobile 442
2017 Keystone Summerland 1750RD
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