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I have some sections of 2" PVC and some Tee fittings that I need to join. On the Tee fittings, the main line is threaded and the outlets are smooth. How can I cut the threads in the straight sections to join with the threaded main line?

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Why do you want to thread the PVC rather than gluing on a 75-cent slip-thread adapter? –  Matthew Oct 1 '12 at 16:19
    
I agree with @MatthewPK - PVC SHOULD NOT BE THREADED! It is to soft. It MUST be glued/clamped. If you are joining PVC to METAL(Copper) use the appropriate adapter. Ring clamp on one side and thread on the other. Costs a few bux but lasts forever! –  ppumkin Oct 2 '12 at 9:42
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3 Answers 3

up vote 13 down vote accepted

I see no reason why you should cut threads on a PVC pipe. It seems to me that this would be unnecessarily difficult and would weaken the pipe.

You should, instead, get a slip to thread adapter and glue it onto the pipe to thread it wherever you like. Any big-box hardware store or irrigation department should be able to provide this adapter.

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Or replace the T with a non-threaded version. –  BMitch Oct 1 '12 at 16:37
    
Heh, you don't. PVC isn't thick enough or the proper material to be threaded. As is noted, there are glue on fittings specifically for this so don't go making up a kludge that has a high chance of failure. –  Fiasco Labs Oct 1 '12 at 17:41
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Threaded fittings on PVC are intended to connect to existing, threaded NON-PVC connectors, such as galvanized pipe or fittings.

When connecting PVC to PVC it should all be glue joints without threads. You have the wrong type of fitting. Fittings are very cheap, much cheaper than adapters.

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Need to thread PVC? Use schedule 80.

"Schedule 40 PVC pipe is for socket fittings (slip glue) only; threading is not a recommended practice.

Schedule 80 PVC pipe can be threaded."

Cite ~~> http://www.usplastic.com/catalog/item.aspx?itemid=23979

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Doesn't answer the question of how to cut the threads. –  Niall C. Aug 19 '13 at 20:47
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