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Old 12-31-2008, 04:08 AM   #1
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Joining ABS p-trap under shower to C.I. drain pipe


When attempting to rebuild a shower (slab on grade), I discovered that the riser coming up from the p-trap was broken. I chopped away the slab and dug out the riser and p-trap. The riser was nearly disintegrated. The old C.I. p-trap, with 90 degree elbow "built in", was attached to the C.I. drain pipe with a 2-strap shielded coupling. All 2 inch.

Hoping I could duplicate the connections using ABS, I went to my local hardware store to buy a new p-trap, riser and 90 degree elbow, the latter needing to be "no-hub" to attach between the new ABS trap and the existing 2" C.I. drain pipe. The only elbows they had have a hub on one end. Is there such a thing as a "no hub" -- both ends -- ABS elbow?

The p-traps they had have hubs on both ends, fine for the riser "side" and the connection to the elbow, but I'm left with a hub end of the ABS elbow to attach to the C.I. pipe. Is there an easy solution?

The old p-trap is probably re-usable, but it is surely quite corroded.

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Old 12-31-2008, 07:25 AM   #2
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Joining ABS p-trap under shower to C.I. drain pipe


Fernco couplings, available at plumbing supply and big box. A rubber coupling with stainless steel bands to tighten around the pipes. Check local code to see if it can be burried.

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Old 12-31-2008, 12:23 PM   #3
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Joining ABS p-trap under shower to C.I. drain pipe


Thx, Bill. I am familiar with Fernco couplings. However, I could not find one on the Fernco web-site that would fit in this situation, given that the coupling would have to fit over the hub of the ABS elbow and the smaller pipe end, two different diameters. Are you suggesting that there is a Fernco coupling made for this situation?
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Old 12-31-2008, 07:41 PM   #4
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Joining ABS p-trap under shower to C.I. drain pipe


Fernco may not make them, but there are definitely rubber fittings that mate different types and sizes of pipe. Again, not sure if they are OK for burial.
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Old 01-01-2009, 02:29 AM   #5
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Joining ABS p-trap under shower to C.I. drain pipe


I talked to a plumber this a.m. and confirmed the solution I came up with last night ...

If I cut a short length of 2" ABS to use as a nipple between the elbow and C.I. tee, than I can use a shielded coupling as you suggest. My local hardware store doesn't carry them, but I called HomeD and they say they have them.

I'll have to check the code ... somehow! One of these couplings was used on the original, buried, but the code could have changed in the last 40 years.

Thx, again for your responses.

Chuck
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