Flange on black tank

[Yacht68]

I'm new to this I have a 1968 international land yacht it has a thetford valve on the black tank need the rubber gasket goes against the flange on the tank can't find it any where local camper stores telling me to take the flange out of the tank and replace with all new stuff I don't want to damage anything can the flange come out of the tank

[Dingo Girl]

If it's like my 67 was the valve is screwed (4 screws) to a mount that is molded in the tank.
The screws on mine were very rusted & I'm not sure they would come out without cracking something.
In the picture the 2 (of 4) rusty upper screws are what mount the valve to the tank. The two shiny ones mount the fitting to the valve. Good with your project.

[68 TWind]

I had to replace both the valve and tank on my 68.
Inland RV should have what you need.

[Yacht68]

Thanks I thought that it maybe I'm think I may get a new gasket if I can and put it back on to my knowledge this tank has never been used

[bibbs]

On my 72' the 4 screw flange looks like it is threaded into the black tank. You could then change everything to valterra type. Or a new thetford valve will come with a fresh gasket

[ALUMINUMINUM]

If it's leaking...

Sometimes it's not the gasket, it's a tiny crack where the tank-flange mounts. Is your black tank polyethylene (Thetford) or is it ABS(unknown manufacturer)?? Cracks in polyethylene are best welded. Cracks in ABS are best epoxied.

Gaskets come with a new Thetford valve.

!968 was an early, somewhat experimental black tank era. For a 30 foot trailer, It would be reasonable to reconfigure the waste system with modern grey and black tanks using Valterra valves.

If time and $$ aren't easy right now, the link below has possibilities...

http://www.airforums.com/forums/f48/...re-159949.html