O Ring groove for flanges

[ldzielak]

Sorry Steve but you do need grooves if you have keyhole cut flanges. On my reactor, I had no luck with the supplied rubber gaskets, went to oring, then found under slight pressure, a small diameter oring will expand and pokes up the keyhole part and lets water escape right in your face. My solution was to use a very think oring, that would not expand. Most DIY will not have keyholes, so no worries.

Lee