ac valve

[George]

Make your own gasket. Find a matching gasket material, cut it out and goop
it up with the right sealant and you're set to go. There is seldom anything
magical about a gasket. Matching the sealant to the application is the trick
and the web can deliver that answer.

Back in the good old days we never bought a gasket that we could make, and
the sealants then were marginal. Today the variety of silicons and other
adhesives makes it easy. 

George Sidman