I'm working on installing a laundry sink. I tied a couple lengths of
galvanized pipe into the existing stubs for the washer hoses. There are
2 new vertical lengths that run a couple feet down, 90 degree elbows,
and horizontal lengths running a couple feet over to shutoff valves.
I wrenched all these pipes together (with tape) and turned the water
supply back on. No obvious leaks, so I thought I was in good shape. A
couple hours later, though, I found that the end of one of the vertical
pipes joining into an elbow was very wet. Not enough to drip on the
floor, but pooling up around the rim of the elbow itself.
Tightening the vertical pipe into the elbow would loosen it from the tee
above, and the pipes are flush against a wall, so I knew I'd have to rip
it all apart to fix it properly. It didn't look bad, so I put some
towels down until I had time to finish it in a couple days.
Now, a week later, the "leak" has disappeared. The pipes are dry at all
the connections. I checked daily since I discovered the problem, and
the towel never got wet. The elbow was wet for a couple days, but it
dried up soon after.
I don't have much plumbing experience. I don't want to take all this
apart if I don't have to, but I don't know how a leak can develop and
then disappear. Seems to me once water finds a path, you've got a
So, is there an explanation? Can I ignore the "leak" I saw, or should I
bite the bullet and pull all the piping apart to fix it?