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Question DetailsAsked on 6/30/2015

cost for a plumber to replace a water pipe in a brick wall

while replacing the kitchen sink, 1/2 of the threaded end of the water pipe broke off in the compression valve.
The pipes extend from an exterior brick/plaster wall.

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1 Answer


By compression valve I presume you mean a compression fitting type sink shutoff valve, leading to flex tubing up to the sink.

Sounds like galvanized steel pipe - and if one end of the thread broke off, I would not have high hopes for the rest of that nipple or maybe even the connecting elbow where it turn to go up ro down in the wall.

Best way would be to have plumber replace it - which probably means removing some plaster to get at the elbow it comes out of - or better yet if you can, come up from underneath in basement or crawlspace with new piece of plastic pipe leading into new nipple and elbow run in from under the sink (or possibly flex pipe) to totally replace that section of pipe and make it all good down to where it is readily accessible, because trying to just fix that nipple will likely mean a leak in the nearby pipe in the near future.

Cheap, likely shorter-term fix - if enough pipe is sticking out, try to rethread the end of the nipple. If no go, go with a galvanized or plastic-to-galvanized compression fitting that goes AROUND the galvanized pipe and clamps to it (cutting off the threads), giving you a galvanized extension or plastic pipe connection there. IF there is not enough nipple sticking out, will mean opening up the wall anyway so might as well replace all that in-wall pipe if feasible.

Reason the threads came off - almost certainly because they had put on a copper or brass shutoff valve (which might be chrome plated) on a galvanized pipe, causing mixed-metal electrolytic corrosion.

Answered 5 years ago by LCD

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