Stubborn bathroom sink drain leak

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Old 12-24-12, 05:58 AM
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Stubborn bathroom sink drain leak

I had occasion to replace the sink drain line in my bathroom. Because the drainpipe in the wall is offset 5-6" from the sink tailpiece, I had to use a 45 degree elbow between the trap outlet tube and the wall tube (rather than running the trap outlet tube directly into the wall, as normally would be the case). The new piping is all plastic. The piping is 1 1/4 inch except for the elbow, which is 1 1/2" (because they apparently don't make 45 degree elbows in 1 1/4" in plastic), using the 1 1/2 to 1 1/4 reducing washers at both ends. No matter what I do, there is a very small leak at the elbow joint. I have never had a problem with leaks in plastic piping. Any ideas on how to stop the leak?
 
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Old 12-24-12, 06:02 AM
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If you could take a pic of what you have we can guide you better. Possibly you dave the wrong fittings.

I would say you have galvanized pipe coming out the wall? Its threaded?
 
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Old 12-24-12, 06:05 AM
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Put a light coating of silicone caulk on all mating surfaces but not on the compression nut threads.
 
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