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Posted by hawgeye on November 26, 2006, 11:51 pm
>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.
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.
> I'm going to use ABS for the shower waste pipes. It looks like most
> showers use 1-1/2 inch plumbing.
Why ABS? PVC is a better suited for drain/waste/vent apps.
> 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)?
The cheapest and easist way is to use a rybber union as you just described.
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