I have a very small leak in a joint where a PVC waste pipe joins into a cast
iron sewer line. Is there anything like plumber's epoxy which will seal the
leak between two dissimilar materials.
I appreciate the help. Thanks.
Where PVC enters metal pipe is a common leak location, particularly if
the metal pipe is old and the threads dirty, thus you can not get the
plastic deep into the threads. Ideally, I'd take it apart and wind
lots of rgw yellow or pink teflon tape on it. But I know you dont want
to rip it apart. It a drain, not pressurized, so go ahead and cheat a
Silicone caulk will work, but your joint must be absolutely dry and
clean. Unless you stop using those fixtures for a day or more, it
wont be dry. Then wirebrush and clean well with something like
carburetor cleaner. Apply a liberal bead of silicone and let it dry
for at least 10 hours before using the pipes. You can also use JB
Weld, and they make a quick dry variety (5 minutes). Of course you'll
never get the pipe out again without a hammer and chisel.
So, the choice is yours. If you dont want to wait for hours, cut the
PVC pipe a few inches from the iron pipe. unscrew the stub, wrap
the heck out of it with the thick teflon tapes, put it back in,
tighten well rejoin the pvc with a fernco coupler. If the threads
are real bad in the iron pipe, get a piece of galv steel pipe the
length of the piece of pvc you removed, apply teflon tape, and screw
it in place. Then use the fernco same as before.
They make a rubber boot with compression clamps on both ends for this
purpose. You'll need to know the diameter of both ends and to use this
you'll have to disconnect it, but PVC is easy to patch back together. I
know that Lowes and Home Depot both sell these in the plumbing dept.
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