I've just installed a sink and am troubleshooting a slow drip. The
drip comes off of the bottom of the trap. I had thought that the leak
was coming from one of the slip nuts, but I held a dry paper towel
around each one while water was running and while the drip was
happening and it stayed dry in each case. I also held my hand over
the trap while water was running and didn't feel anything dripping
onto the trap from above.
My conclusion is that the trap itself is leaking, although I can't
actually see or feel any cracks in it. I know that I often overlook
other explanations in situations like this. Am I missing anything?
Thanks for your help,
Check alignment of pipes. Sometimes if the drain pipes aren't aligned,
the connection isn't tight. You might also try wiping connecting surfaces
to see if there are any burrs or crud to be removed. Any surface
imperfection can also make things leak.
Finally, snug up the nuts but don't over tighten. Over tightening can
strip threads on plastic and break nuts on metal.
Is this a kitchen sink? If so, did you mistakenly install a drain
basket for a cast iron sink onto a stainless steel sink? With the
latter the threads on the basket do not go all the way up, so a
thinner stainless sink will never get the basket tight enough, and the
putty will be all that stops the water. The drip will always look
like its coming from the P trap.
If this is a bathroom sink, the pipe that forms the "basket" for the
popup may be leaking. In other words the pipe that enters the bottom
of the sink. Those can be a pain to seal. Plumbers putty dont always
do the trick. After dealing with this problem several times, I put
silicone around the pipe before tightening the nut against the sink
bottom. The popup (plunger) nut could be leaking too.
If it's a brass/chrome trap, you just may be right.
Often, the brass will dissolve away from the inside,
leaving a very thin shell. Forces exerted on the trap
while re-installing then crack the brass in a hairline
which may be very difficult to spot, glasses or not.
Take the trap off again and twist it with both hands.
If it's corroded it will collapse.
ahh they always leaked for me, cheap chincey junk quality.
havent had a leak in over 10 years after paying plumber to fix one. I
do what he did.
Dry fit everything so it goes together OK
Mark so its easy to disassemble
Take apart and silicone bathtub caulk all fittings.
no more leaks ever, easy and stuff peels off if necessary
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