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 ...

Now, it's time to connect the faucet's water supply lines to the shut-off valve beneath the sink. With mine, the water lines were attached to the new faucet, but this isn't always the case.

Finish the job by soldering both joints. For more on plumbing, consider: How To: Install a New Kitchen Sink 8 Common Water Problems—and Their Cures Top Tips for Troubleshooting Low Water Pressure ...