Connect 3" drain

[Mar3232]

Photo is attached on what I need to do. I cut out a rotted copper pipe between the 2 pieces remaining and fortunately they are both very solid, the "flange" around that copper elbow and the piece entering the iron discharge pipe.

I have been trying to manipulate an assortment of rubber couplings, pvc (and a combination of both) but it's leading nowhere because the position of the 2 are just mismatched enough that it's friggin impossible.

Don't they make (haven't found anything yet) that is a simple flexible piece of tubing that I can get in there and just clamp both ends and be done with it? I would think they would sell the 3" rubber by the foot somewhere but no. (?) (!) It's about a 60 degree curve but I've been screwing with conventional fittings for 2 hours. -- THANKS kindly.

 

[Mar3232]

actually it's a straight copper coupling not an elbow obviously.

 

[Sponsor]

 

[Reach4]

How does the picture you posted relate to the problem you are describing? In the photo, I see a copper pipe that is not 3 inch. I see some kind of a drain line that is not copper.
Is this the same problem you were discussing in https://terrylove.com/forums/index.php?threads/drain-leak-help.63975/#post-474419 ?

 

[Mar3232]

the white piece on the right is copper that was painted when the walls were sprayed and a 3" rubber coupling fits perfectly on it so I'll assume it's 3 inch. the piece on the left is also copper but was wrapped with fiberglass and who knows what but is sturdy and not rusted or weak. As I said, I cut out a piece of copper pipe that was between the 2.

 

[Mar3232]

could I use polyethylene corrugated pipe ?

 

[Reach4]

could I use polyethylene corrugated pipe ?

That sounds like a particularly bad idea. IMO, Fernco wrap idea was better, but if you did that, you would want to get Fernco FPW4252CS which is the larger version. Or at least get the middle size. I am not a pro, but I like that Fernco wrap idea. I think it is important to follow the directions and make the wrap tight while it hardens. https://www.menards.com/main/store/...fernco/Prod_Tech_Spec/powrwrapspecinstall.pdf

If you want further suggestions, I suggest you post a photo that includes the whole area that you would involve in a fix.

 

[Dj2]

Try posting additional photos.

 

[Terry]

Rubber couplings don't work because they sag over time.
It looks to me that you will need to do some major replumbing there. The copper going bad is something that will happen to the rest of it too. I don't think copper was ever a good idea for waste.

The type of coupling we use.

 

[Mar3232]

Terry -- you beat me to it. I just realized it will be easier just rebuild everything so it lines up. I'll just get rid of the copper and do PVC.
But when I go into the cast iron stack, how do I do that ? I have a piece of copper in there now (that black piece on the left) (looks like it was wrapped in fiberglass and they tried to fix it?)

I guess I could try a short rubber coupling onto that black piece but It's really best to let the pipe get inside the hub isn't it? Also read about a cast iron hub adapter? Anyway, live and learn -- just going to rebuild it (except for the stack of course)

 

[Mar3232]

Or I guess that coupling you're showing me is the way to go? and then PVC from there?

 

[Terry]

Or I guess that coupling you're showing me is the way to go? and then PVC from there?

It depends on what you have on the cast. It's hard for me to tell on the picture. Those couplings above come in many variations. They can be bought in copper sizing, cast, and plastic.