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Old 09-12-2017, 10:15 AM   #1
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Leak in threaded PVC plug, how to cut new thread in PVC elbow


I have a leak in a threaded PVC plug with a 1/2" thread. The plug is in a 2" diameter 90 degree PVC elbow in a pool skimmer line (See attached pictures).
The existing thread in the elbow has play and the plug can't be tighten.
One way to fix it would be to enlarge the 1/2" threaded hole to 3/4" and use a 3/4" plug. Can anyone tell me how to drill a larger threaded hole? I don't know what tool I would need to do that.
Are there any other ways of fixing this leak?
Thanks
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Old 09-12-2017, 10:49 AM   #2
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Re: Leak in threaded PVC plug, how to cut new thread in PVC elbow


I've never run into tapping a new hole in PVC....... I'd be very skeptical of it working. (Maybe others have some experience)


1) As it is a skimmer, subject to relatively very low presure, I'd wrap the he!! out of it with teflon tape and see if that does not seal it.

2)Alternatively, you might find a rubber expansion plug at a plumbing shop or hot tub store (maybe a Home Depot) that is 1/2 with a little lever on top that expands the plug when you insert it. (If it leaks agaainst the threaded female, you might drill out just the thread to get a better seal.

3) If that is not necessary as a drain, you could clean it up real well and use some pvc/primer/glue and maybe just glue/weld it in permenent.

Good luck
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Old 09-12-2017, 03:50 PM   #3
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Re: Leak in threaded PVC plug, how to cut new thread in PVC elbow


That seems like a very odd place for a plug, never seen a plug on a elbow before. What is it's purpose? If it serves no purpose, I'd just cut out the elbow and install a new elbow.
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Old 09-12-2017, 04:04 PM   #4
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Re: Leak in threaded PVC plug, how to cut new thread in PVC elbow


Quote:
Originally Posted by Joeycarnuba View Post
That seems like a very odd place for a plug, never seen a plug on a elbow before. What is it's purpose? If it serves no purpose, I'd just cut out the elbow and install a new elbow.
Thanks for your response. The plug was installed to do a pressure test. I could be useful if a pressure test is needed in the future. My skill level with PVC pipes is low. Cutting the elbow and putting a new one seems difficult to me. I will try simpler options like using a fair amount of Teflon tape first.
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Old 09-12-2017, 04:06 PM   #5
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Re: Leak in threaded PVC plug, how to cut new thread in PVC elbow


If there is a purpose for the pipe plug I would change that out for a T and add the plug to the top of that.
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Old 09-12-2017, 04:17 PM   #6
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Re: Leak in threaded PVC plug, how to cut new thread in PVC elbow


It is really not hard, ask around, find a friend that is not afraid of this and pay attention and you will never be afraid of it again.
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Old 09-12-2017, 06:15 PM   #7
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Re: Leak in threaded PVC plug, how to cut new thread in PVC elbow


Quote:
Originally Posted by sssanti View Post
Thanks for your response. The plug was installed to do a pressure test. I could be useful if a pressure test is needed in the future. My skill level with PVC pipes is low. Cutting the elbow and putting a new one seems difficult to me. I will try simpler options like using a fair amount of Teflon tape first.
Teflon tape should work if it's slow leak and low pressure
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