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Stop right there! I have/had a similar leak that I discovered last week while camping on asphalt. Dripping around the outside valve area and dripping out of the small hole in the belly pan beneath the trailer. Thought it might be the freshwater holding tank as the water dripping didn't have any odor or slipperyness to it. Began probing inside the trailer through our small access port to the pump. Initially didn't see anything but after disconnecting the furnace duct, I noticed a small puddle of water.
Couldn't figure out where it was coming from. I'd wipe it up and then it would reappear. Discovered it was coming from the cold water line to the outside shower. I thought the line was cracked due to a failure in winterization. Couldn't feel a crack in the line. Went to HD where we were camping.. It's always fun to spend time fixing your trailer on a camping trip when you could be fishing... and bought some PEX line, crimp tool, and a Sharkbite stop. I tried to cut the pex crimp with a mini hacksaw to take the whole line out, but in that tight compartment, the effort was futile. Wait until I get home and Dremel it off!! I ended up cutting the line and capping it off with the Sharkbite. Don't leave home without some Sharkbite fittings!!
As it turns out, there is no crack in the line and I see corrosion on the copper pex rings just below the screw-on fitting to the outside shower and on the backside of the metal screw fitting itself. The inside rubber gasket looks not so good. I'm assuming the rubber gasket failed over the last year some time.... Bummer... but the trailer is still under warranty.. I will taking it to JC here soon for full repair.
Not sure if your setup is similar, but the symptoms sure are.
(strange coincidence- my folks had the same leak on a new FW last week. Difference being, he CRAWLED into his giant locker space and tightened the fitting and cured his leak!) I must say at times I envy the access on a FW.
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