I posted this in the Plumbing forum, but haven't got any replies, so hopefully someone can help here...

Can anyone tell me what this is? It's a century home with a full basement. As you can see in the pic, this trap-cleanout thing is close to the septic line, where it exits the house.

Thanks!

It's best to find a forum with a few more OldTymePlumbers.......

Try the Terry Love Forum......

http://terrylove.com/forums/

You might try more info and overview photo..........

"...measure once.....cut twice....throw that one away and cut a new one...."