When installing a new "P" trap under a bathroom vanity how is it sealed into
the drain pipe in the wall? The one that was removed was so rotted it came
out in so many pieces that I could not tell if it was soldered or held in
with caulk. The inside of the copper drain pipe cleaned up nice so I don't
think it was soldered but not sure what was there. This house is over 50
year's old pre PVC.
Were there threads on the copper drain? The most usual thing I see is a
standard slip compression type gasket that slips over the piece that
exits the "P" trap. The seal is acheived by the nut that tightens over
the threaded drain pipe that exits the wall.
As Richard said, the pipe sticking out of the wall is usually threaded for
use with a compression gasket.
However, if you have an inch or two of good pipe still sticking out of the
wall, you can use a "Fernco Coupler" to connect the trap pipe to the pipe
in the wall. These are big rubber bands that slip over each pipe, and have
a band clamp at each end to tighten it to the pipe. They come in a variety
of sizes and in reducing versions as well. Most home centers like Lowes and
Home Depot carry them, as do virtually all plumbing stores. Most sizes cost
around $5 or less.
I've used Fernco couplers several times in the past while doing plumbing
repairs on my in-laws house. They have old galvanized piping that corroded
and broke in places. I cut the pipe back to where it's still intact, then
use the Fernco coupler to connect new PVC piping. Works great for repair
situations like this.
I also used them in our new house to join PVC and ABS pipes where there
wasn't room for male/female adapters, and for the shower/tub traps in our
crawlspace (easy installation and removable for future maintenance).
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