So the ABS and PVC threaded male and female adapters that are sold at your local building supply stores are straight threads? I’m guessing that the NPT designation indicates a tapered thread?
I'm reasonably certain that the female tank fitting is tapered, and ETI is sticking a straight threaded male fitting into it. But if you take the joint apart (which you probably can't do without cutting pipe, so you're not going to do this just to find out), you can measure and check.How do you tell which fitting you have?
I too have the same leak under the sink in 2019 5.0 while under warranty. I too contacted ETI and was told the same, take it to an RV repair shop... After talking with Destin he supplied me with a detail sheet so I could do it myself and be on my way, but the following season the same thing. My thinking is that something is moving and the other component is remaining still, so I disassembled the repair thinking it failed but no, now it looks as though the female collar is leaking! I don't know if this issue would prompt a recall but I feel ETI should follow up on these occurrences.
I've recently become a member of this elite drain squad... I've read this long set of posts with great appreciation and respect. I really was not thrilled to come home after what was basically our first trip in too many years (.....) to find three (so far) gray water connection failures. At least I don't have foam. But now I have solutions thanks to all of you!
And by the way when I asked the tech at our local RV repair shop (Century RV in Eureka, CA) about this repair, he said these are pretty common 5 years in. Sealants and plastics have about that lifespan. Made worse of course with unnecessary stresses.
Has anyone here done the repair of the grey line to the grey tank on a 5.0 for the bathroom drain. I can’t figure out where to start. Just completed the kitchen drain.