Here's how to install a hot or cold water shut-off valve under your sink. Apply plumbing sealant to the shut-off threads and attach it with a nut from the faucet tube. Measure the length of the copper ...

Q: I was going to replace my bathroom faucet, but when I tried to turn off the water under the sink, the valve started leaking and it won’t stop. I’ve postponed the faucet replacement until I can ...