dometic 310 seal

I friend of mine replaced his seal for the same issue. Still leaked by.

Here's a link to the conversation on it. Tab down to post #24. Bottom line slightly loosen the 2 screws that hold the water valve down.

No adjustment. Clean the moving plastic piece good along the edges that are in contact with the seal.

I don't believe there is an adjustment. Throw on a latex glove and work the lip of the seal up and down with your finger to give it some pliability. Then rub a thin film of petroleum jelly on It (both sides). This has always worked for me.

It is in his toilet.

Would help for some more info