Originally Posted by Jimbo7
is the top of the T completely sealed?
Nope top of T is completely open, I have a cap on it that I drilled 3, 1/4" hole so that air can escape, but I can also take the cap off completely. I would still get a gurgle every couple of minutes. I am thinking of taking that T off and go with one of those %45 Ts, and also upgrade to a larger 11/2" pipe. From looking down at the drain with the cap off, it looks like water is being held up at the T. Not really sure though.