[Pete_Dab]

I’m planning to ad a bathroom in my basement. The house was built in 1999 and the builder installed the piping in the concrete basement floor. There is a 4“ pipe for the toilet, and two 2” pipes for a shower and sink. These three pipes extend out of the floor about 18”. There is a vent pipe that comes out of the basement floor and run up through the first floor. There is also a 6” pipe cut flush with the floor that has a threaded plug about 18” below the floor. I have not opened this plug but I assume this is a clean-out trap or a back-flow preventer. There is a similar pipe near the floor drain (opposite end of basement) that I have opened and it is a back-flow preventer. Here’s my question: There is an addition pipe in the bathroom area and I do not know what it might be for. The pipe in question is 2 or 2.5” and about flush with the floor line. The pipe has a threaded plug in the top and the plug has two large slots in the top that appear to be for a large Philips screwdriver. The plug threads also appear to a sealer on them. Any thoughts on what this pipe might be for??

This board has been a great source of information as I get ready to start this project. Thanks in advance, Pete

[labman]

Sounds like another cleanout to me. Likely Tom will confirm that when he stops in.

[speedball1]

Hey Pete, Listen to the Labman, he's correct. This is a clean out for the lavatory or tub drain line. Instead of a regular cleanout cover with a raised square your plumber installed a flush clean out cover so it would be handier to walk around. Best of luck, Tom

[Pete_Dab]

Thanks, Labman and Tom, for replying to my posting.
Pete