Waste pipe sizes and joining ABS with copper


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
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snipped-for-privacy@yahoo.com wrote:

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
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well abs is kinda sucky so i would suggest PVC but there are 1-1/2 to 2 rubber union adaptors

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-=-=-=-
I've learned that a 1-1/2 inch ABS pipe isn't really 1-1/2, but a 2 inch copper pipe is actually 2 inches. Will such an adapter fit both? Is there such a thing as a "specialty" adapter for ABS to copper pipe, since they seem to use different rulers for measurement? (c:
What's so bad about ABS?
Thanks, Dave
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Just went and bought a 2 inch threaded male fitting (copper) and a Y (ABS) and threaded female fitting (ABS). Will cut copper pipe and solder male fitting and then thread into ABS female. Then glue the female fitting to Y and away I go!
I already have 2 inch ABS pipe and fittings, so I thought I might do the drain all in 2 inch. Any reason to not do this?
Thanks, Dave
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First off, showers are 2", not 1 1/2". Bathtubs are 1 1/2". Yes, there are adapters made to join pretty much anything that should be joined. You can try Home Depot, ask a clerk for their 'Fernco' fittings, Fernco is one of the largest makers of rubber couplings. Each fitting will have a label which will list the types of piping that will fit. If they don't have what you want, try a real plumbing supply.
-- Dennis
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Technically that 2" copper is tubing not pipe, that being the difference. Pipe is nominally sized by it's ID whereas tubing is sized by it's OD.

Why ABS? PVC is a better suited for drain/waste/vent apps.

The cheapest and easist way is to use a rybber union as you just described.
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yes.
--


MichaelB
www.michaelbulatovich.ca
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