Where to buy these plumbing parts ?

[zookie]

You could also use an epoxy and it would seal it.
I have used a 2 part on commercial salt water systems pressure side and has held for years.
If you try it warm the epoxy a little for better bond. Good luck either way.

[DouglasReid]

Originally Posted by rac54

I had a somewhat similar situation with the outside shower header assembly on my old Sprinter years ago & ended-up "coating" the crack with JB Weld. It was still holding when I traded the trailer.

X2...I have also used a good 2 part epoxy glue or fiberglass resin. If you can wrap a bit of fiberglass around the outside it will actually be stronger than it was originally.

[PammyM]

Campers Inn is going to order one for me from Forest River for $20ish, which will include all of the pieces from the sink drain to the outside of the popup. 😊

[Villagerjjm]

It is not a standard "p" trap... it is black ABS pipe.... Replace it with the same type. You can find it at ACE Hardware.