wrote:

I want to add a shower in the bathroom of my office. This is a
commercial structure.

The available copper waste pipe, unlike other pipe compositions,
actually measures 2 inches in diameter. I see in the home improvement
center that the 2 inch ABS is larger than 2 inches.

I'm going to use ABS for the shower waste pipes. It looks like most
showers use 1-1/2 inch plumbing.

The sewer pipe coming out of the slab is cast iron, and a copper waste
pipe (from a utility sink nearby) Y's into it using a copper elbow. A 2
inch rubber union (the kind with hose-clamps) connects the copper elbow
to the cast iron Y. I could replace the copper elbow with a Y (copper?)
and run the ABS into that.

How can I mate the ABS to the copper pipe or Y? Are there adapters to
go from one material/size to another (ie, 2 inch copper to 1-1/2 inch
ABS)?

Other suggestions?

Thanks,
Dave


2" copper is 2 1/8" O.D.

Shower drains are 2" trade size.

There is a coupling to join "anything" to "anything". g
http://www.fernco.com/

I assume you are not too concerned with the niceties
of inspections and permits and venting requirements
on this job...

Jim