Connecting ABS to Galv DWV pipe

Old 02-27-08, 09:00 AM
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Connecting ABS to Galv DWV pipe


I am in the middle of a bathroom demo. and and preparing to add another sink in the bathroom. My current DWV pipe is gal. pipe that runs into a cast iron vent stack. Can I use ABS and splice in the vent and drain into the existing pipe? I was hoping to be able to unscrew at joints and add in the ABS pipe, or should I replace all the glav. pipe and use ABS for the bathroom and hook it up to the stack vent and the sewer below the floor. Here is a pic of what I hope I can do. Also if you notice that I still have the original galv pipe for 1968 that I need to replace as well. Havent decided yet as to what I will use, copper or PEX.
any help, thoughts, comments would be appreciated.
Old 02-28-08, 04:04 AM
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There are ABS/PVC fittings to join it to most any other kind of pipe. Connecting to galvanized is easy. The hard part will be getting the old galv. fittings off.
Old 02-29-08, 10:37 AM
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I wouldn't even try getting the old fittings off. I'd just take a Sawzall to the vent pipe, then connect into your new ABS with a Fernco coupler. (probably the same with the drain, but it's not shown in the pic).

Keeping the galvanized for the vent should be fine, but I would replace any galvanized drain pipe with ABS/PVC. It's likely that it's all blocked up with gunk and crud it's worth the replacement.

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