We DO have a lot of engineers in this forum.
I make this suggestion without a clear mental picture of the fittings you're working with, in the spirit of offering some encouragement.
I had freezing damage once on a trailer's drain manifold with ABS plastic fittings. It was going to be a huge pain to tear them all out to replace about 2" in the middle, so I just goobered (technical term) ABS glue on the crack and it worked perfectly.
You have the same thing going for you in this application: the water is not under much pressure. You also have one additional asset that I didn't have: "Heck, it's only gray water, so a few drips from a leak under the middle of the trailer might be an adventure, but it's probably not an EPA reportable event."
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2005 TrailManor 3023
2003 Toyota Highlander 220hp V6 FWD
Reese 1000# round bar Weight Distributing Hitch
Prodigy brake controller.
"It's not how fast you can go, it's how fast you can stop an RV that counts."
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