Plan to fix PVC threaded joint leak

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I think you will end up needing to buy a new schedule 40 union, removing the old, and gluing in a new one.

Or forget the union and just use a coupler and glue the pipe together. Then put in a better pump union next time you replace the pump.
 
Looks like there is O-ring (rectangle cross section) stuffed within the pipe.
 

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Measure the Inside Diameter (I.D), Outside Diameter (O.D) and Cross-Section (C.S).

ID + 2 CS = OD.

CS = (OD - ID)/2.

Enter the values into the calculator to find the O-ring size and order by size.

See example below.

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AS568 O-Ring Size Chart - Marco Rubber

Interactive standard o-ring size chart to find Parker and AS568 o-ring size dimensions. Order Online millions of o-ring sizes are in-stock
www.marcorubber.com www.marcorubber.com
 
@JamesW You are awesome. Thanks! :) It’s 2 1/2" x 2 1/4" ID x 1/8" CS square (cross sectional shape) o-ring. Can it square (internet says, they exist and are called square rings) or they are circular but got deformed over the years?
 

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JamesW said:
TFP is a registered 501(c)3 non-profit that is maintained by user donations.

The people who answer questions are volunteers.

If you find the site to be a good resource, please consider making a donation to help support the site.

Thanks.

www.troublefreepool.com

Become a TFP Supporter

Help Support TFP Trouble Free Pool is run by a dedicated group of volunteers that … Read more…
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For sure 🫡
 
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Wow, TIL! Thanks for the PVC Repair link! I have removed the Teflon tape from the threads. Just confirming my understanding, based on your comments & article, the reason for not using Teflon tap is that it may become easier to over-tighten when Teflon tape is present? The over-tightened state with pump's vibration may lead to cracks in union or deformation of O-rings, I presume? Thanks again guys.
 

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