Black tank square flange adapter
1970 27' International Land Yacht Overlander full rear bath. I need to replace the white square flange adapter that fits onto the black tank that the Thetford dump valve then screws on to. I've seen a couple of pictures from previous posts by John HD that showed this piece but I can't seem to find it with an internet search. Can anyone tell me where I can get this piece. Also, is there another type of sealer to use for this repair that is acceptable in the absence of Vulkem.