Originally Posted by movinair
I am restoring our '57 Overlander. One of the few good things that survived the deconstruction was the fiberglass blackwater tank. The tank fittings on the inlet and outlet were cracked though. With what can I connect new ABS fittings to the fiberglass tank? Will the West System Epoxy I have (used on the marine plywood) work to seal that fitting to the tank?
Any advice greatly appreciated!
I was really happy to come across this thread. While I own a 68 trailer it is not an airstream but I am in a similar situation with my fiberglass black tank. When I got it the 4 corners of the outlet where it would marry up with a Valterra blade valve were broken off. See the attached photo.
I need guidance on the best way to connect a new abs fitting to the outlet. The plan I have now is this:
1. Remove the remainder of the broken valve carefully. Hopefully exposing the roughly circular fiberglass outlet.
2. Clean off the outside and inside of the outlet. Rough up all abs surfaces for better bonding.
3. The ID of the outlet is 3". I am going to take a 3" OD piece of ABS tubing and insert the piece into the outlet. (If a 3" od tube exists) Bond the outside of the ABS tube to the inside of the fiberglass outlet
. (What is the best way to do this
4. Take a marine grade 2 part epoxy and some fiberglass cloth (Which ones do you suggest)
to add strength and ensure a watertight bond.
5. Take a 3" Valterra slip hub (Which has a 3" ID) and slip over the ABS tube and bond together (With what? The 2 part epoxy? Something else)
6. Finish with bolting the 3" Valterra Blade Valve to the slip hub. Get a watertight seal and trouble free black water experiences forever
Thank you in advance for any help and guidance on this and referrals to particular bonding products and approaches that you have used successfully.