Review on Commercial Quality Expansion Pipe 13 by Mark Greenwood

This doesn't quite fit the tube I was trying to plug, but it's the closest size I could find. This is not entirely true. Insert the female ground pipe into the old drain. I think the bottom threaded pipe was originally intended to install a threaded riser against possible backflow, so it's a custom size. But this pipe plug is nicely made and appears to be of good quality. If you have a standard sized pipe you want to use it on, it should fit and do the job.