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?

  • 8
    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
  • 1
    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! – Piotr Kula Oct 2 '12 at 9:42
  • Fishing pole would be a good application. – johnny Jun 24 '16 at 20:27

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.

| improve this answer | |
  • 7
    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

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.

| improve this answer | |

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

| improve this answer | |
  • 1
    Doesn't answer the question of how to cut the threads. – Niall C. Aug 19 '13 at 20:47

Use an NPT tap to make the threads.

| improve this answer | |
  • 1
    Hello, and welcome to Stack Exchange. Given the responses already present, this doesn't add useful information. – Daniel Griscom Jan 28 '18 at 23:16

I used a socket wrench with a ratchet handle for the tap wrench. Be sure to use the recommended drill bit size for the pilot hole.

| improve this answer | |
  • Hello, and welcome to Stack Exchange. The original poster was asking about threading the ends of 2" PVC, which would already include a 2 inch "pilot hole". And, the taps you included a link for only go up to 1 1/4", so they wouldn't work for the OP. – Daniel Griscom Jan 29 '18 at 0:03

Not the answer you're looking for? Browse other questions tagged or ask your own question.