There's a cleanout plug on this pipe that I simply can't get loose. I've tried liquid wrench, PB blaster, heating up the area with a torch, everything I can think of. All that's really left is to go after the plug with a drill and a saw and just pull it apart. However, none of my local hardware stores HAVE any 4 inch cast iron, all they have is PVC. Can I put a PVC cleanout plug in a Cast Iron cleanout?
Plumbing – use a PVC cleanout plug in a Cast Iron Cleanout
drain-waste-ventdrainagemaintenanceplumbing
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Best Answer
Yes, it should be no problem. Just use teflon tape on the threads to seal it.
I would worry though if you can't get the plug out, that the threads in the pipe won't be any good (or you'll destroy them in the process of attempting to get the plug out). If that happens, you'll need to re-thread the pipe. You should be able to rent a tool for this at your local tool rental place.
You don't mention what the pipe is, so just be prepared that you may not be able to use it until it's repaired, if you do have a problem with the threads.