Dropping belly pan that covers black and grey tanks?

[James Schmidt]

I'll wager that your drip or leak was coming from the slip flange or adapater as you called it. I had 3 to break since I've had my 93 trailer. They seem to crack near the bottom of the flange and will cause a small drip when there is sufficient wanter in the holding tank. Rebuilding the dump valve is not a bad idea while you have it out but look closely to see if it really was the culprit.This is a Thetford part and was made of white plastic. Now they are making them of black plastic--hopefully they will last longer.

Good luck with the project.