My upstairs shower drain leaks such that if I use it, water comes out of a can light in my living room.
The shower base is a mustee. The drain is molded into the base and the pipe was held in by a rubber doughnut (compression fit). Not being able to find a new doughnut at the home depot and not knowing much about shower drains (at the time) I called a plumber. He said he had never seen such a shower base and recommended I replace it.
He put in the temporary fix of removing the doughnut and replacing it with a plastic fitting which he fastened to the pipe with the purple primer and glue... then ran a bead of caulk to try and seal it off. That fix has prevented the pipe from falling out of the shower base, but has not stopped the leak. I have since tried removing his caulk and filling the entire gap between the added fitting and shower base with silicone. This has also failed to stop the leak.
Does anyone have any advice short of replacing the shower pan with one of the screw-in drain variety?