You can put a Fernco cap on it, then tighten it up.

Here is a link that might be useful: caps

Double post - sorry.

Here is a link that might be useful: caps

This post was edited by homebound on Thu, Jun 13, 13 at 21:43

Homebound, I like that idea...but my drain pipe doesn't extend beyond the drywall wall. So, I don't think I could get the clamp tightened without opening the wall up.

Other thoughts?

If there's room to slip it on, there will be room to tighten. The hose clamp just required the turn of a screwdriver.

Or you can use the type of plug with the wingnut.

Or you could fill the trap with water, put a drop or two of mineral oil down there, and that will slow down the evaporation of the trap. Then just cap the top with a plastic bag and a couple rubber bands. (High tech solution!)

There are plugs, sometimes called test plugs, that can fit into the pipe that have a bolt in the middle which, when tightened, expands the plug to fit. Most hardware store carry some version of one.

Here is a link that might be useful: Pipe Plugs

Many actually are 'test plugs' and carry no listing for permanent use.

Hi, I used a test plug to close a hole in a pipe. Been over 20 years, still working.
Good Luck Woodbutcher

Okay, so is the consensus then, that although not "listed" for permanent use, one of these wing nut test plugs could be used as a semi-permanent-not-permanent solution?

Another way to say, are there any plumbers out there who think this would be a very bad idea (why?)?

Thank you!