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
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Need more time for the tank... Break a leg!
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