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Old 11-28-2010, 08:29 PM   #1
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Identifying plastic pipe

I have a 1 -1/2" stub of gray plastic pipe sticking up out of my slab that I need to connect a drain line to. The pipe was installed in 1967 when the house was built. Could the pipe be polybutylene or was polybutylene not in use that early? If the pipe is not polybutylene, what would it more likely be?


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Old 11-29-2010, 06:46 AM   #2
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I am old enough to remember, but if it was PB, don't use it. Gray was usually electrical conduit.


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Old 11-29-2010, 07:59 AM   #3
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I'm not too sure that the question here should be: Where does this pipe go to? Simply identifying it as any particular plastic material is moot if you don't know where the other end is, or is attached to. Homes built in the late '60's, with a grey colored "plastic" piping, I would also be betting that it was an electrical conduit installed for later use, maybe running a line outside.
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Old 11-29-2010, 10:43 PM   #4
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not so sure they were using plastic conduit in the 60's. I'm going to go out on a limb and say that it wasn't meant to be a drain. are you sure that this wasn't something that was added for some reason or other? What drain are you connecting to it anyway?
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Old 11-30-2010, 08:31 PM   #5
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They were using PVC conduit in 67 and I'd bet that is what this pipe is.
Always ask to see your contractors license!
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Old 12-01-2010, 05:45 PM   #6
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Thanks anyways, all.

Sincerely, thanks for giving it some thought.

The line was definitely the drain for the A/C, and quite obviously installed by the HVAC tech's.

The line is more likely than not PB, as I took a sliver and immersed the sliver in PVC glue and the glue had no effect whatsoever.

Anyhow, I just used a compression fitting and that seems to have worked well. Of course, I polished the crap out of that stub with 1000 grit wet/dry sandpaper.


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