Originally Posted by TG Twinkie
You can get a twist on Valterra valve that will fit where the sewer hose connects. Put it on, put the end cap on and you are set. At least you won't have the mess of black water when you remove the end cap.
You can get the Valterra valve online or maybe at CW.
I believe the plumbing on the 94 is Thetford. If it is you can get a Thetford to Valterra adapter and proceed as above, Thetfoird now makes limited plumbing parts.
Your 22 year old Thetford valve has had a good life. Replace it with Valterra which does not need to be glued in. While you are at it you might as well do the grey water valve.