Hello, I have a Ravelli RV100 and am currently wrapping up yearly maintenance thanks to this forum and a lot of YouTube. My 4” tee cap was very tough to get off at first but I was able to eventually pry it off. Unfortunately while putting the tee cap back on I mangled the red rubber ring gasket and it ripped. I have scoured the internet to find replacements but to no avail. I tested it without the gasket, but of course I had a lot of smoke leaking out. My question is, is there anywhere I can buy these gaskets? Am I searching for the wrong thing? When I get the gasket, where does it go? Does it go on the inside of the cap? TIA!