Good news is that the leak wasn't the any of the plumbing for the black tank wash line like I thought it was. Ended up being a blindingly obvious problem with the grey tank for the kitchen I could see from 15' away once I opened up the coroplast.
How is a dump valve suppose to be mounted to the grey tank? It looks like there was a little caulking or putty & a hose clamp holding about 1/8" of pipe jammed into the tank. I don't understand how that held up for as long as it did.
Do I just do the same thing with a longer nipple glued into a new valve? Get one of those rubber couplers with the hose clamps on both ends? At least those are designed for that, not clear if the inner & outer diameters of stuff match up.
What do you usually repair the coroplast with? It looks like there was previous repair work done around the black tank. They used some kind of tape that looked like a black woven tarp previously. I pulled most of that off to look for the leak, then ended up cutting a new hole in the back once I found the actual leak at the other end of the coroplast. Duck tape usually doesn't last outdoors.
Nice plug from a hole saw & a pile of plastic shavings plugging the valve too.
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