This is an old shower drain in the basement that I don't plan on using. I had a water problem at one point which is now fixed, and water would pool up in that divot. I was originally intending to take it out, so I drilled the hole into the pipe for water too drain into it. Now I'm not taking the pipe out and I want to cap it with a clean out cap. What would be the best way to seal up that hole in the pvc without chiseling out enough cement to slip on a coupling to cover it? I don't expect it to ever back up, but just in case it would be better if the hole were waterproofed.
>without chiseling out enough cement
What exactly is your objection to chiseling out more cement? Do it right the first time. Chisel out enough to fit a proper cleanout, keep it flush with the floor and plug that hole.
It wont even take a long time and all he needs is a hammer and some steel with a sharp end if he doesn't want to buy a chisel.
Unless he has the FBI listening on his dungeon construction and has to be as quiet as possible I know of no other concerns.
get a plug, pic related, and shove it down enough that its past that hole you made before turning the screw to tighten it
stop overthinking it, just plug it with piece of rubber, there is no way the pressure in that thing will cause it to leak since there will be no place for it to go once the new concrete is there.
I'd chisel out enough cement around it (even an old large common screwdriver would work) then clean off the PVC stub slightly below the floor and glue the correct PVC cap on the end of the tube. Grout result flush with floor and done. No gas, no leaks from future backups, and stupidly cheap.