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Question DetailsAsked on 3/7/2014

average cost for replacing bathroom hot water valve?

very slight leak on hot water valve nder bathroom sink vanity

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1 Answer


I assume you are talking about the shutoff valve under the sink, not the fauctet itself.

If it is leaking around the stem, it may just need tightening of the bonnet - the 6 or 8 sided cap, usually dome topped, that the stem goes through into the valve. Holding the valve itself steady with wrench or channel locks so you are not twisting the pipe, use a crescent wrench or channel locks to slightly tighten the bonnet cap - should only take about 1/16 to 1/8 turn or so to snug up the seal inside it. Ditto if leaking where the flex tubing to the faucet comes off the alve if that is where it is leaking - just a slight tightening might do it - do NOT reef on it.

If you are more home handy, and tightening it does not solve it, likely replacing the seal or gasket in the leaking part would solve it - means taking it apart (after turning off water supply to it, of course) and going to get matching gasket at a plumbing supply source. If leaking at a threaded connection, may need to undo the connection and use new teflon plumbers tape during reassembly to stop the leak.

If that does not do it or you have never worked with plumbing at all in the past so you don't feel comfortable messing with it, then new valve is about $5-10 for the part. If you call a plumber, I would just have him put in a new one rather than rehab it - labor cost should be the same, so might as well spend the $5-10 in parts for a new one. Plumber labor to replace it about $75-150 typically - should be minimum service call charge for this type job. Since minimum charge will apply, if you have any other leaking faucets in the house it is likely you could get them fixed at same time for little or no additional labor cost.

If you are lucky and at all handy with tools, IF the valve itself is a threaded connections to the pipe AND the tubing to the faucet rather than soldered, if you are able to shut off the household water, drain down the hot water at some lower point in the house, then unscrew the valve (will leak out up to a few tablespoons of water), replace with a new one you have bought (using teflon thread tape to seal the threads) snugly but not reefing on it to tighten it on, you will be good to go.

Answered 6 years ago by LCD

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