Upgrade Your Supply Lines
One of the most difficult parts of installing a new faucet used to be connecting the supply lines so they didn’t leak. But the new-style connectors with braided jackets have gaskets built into each end that make connections virtually foolproof. They cost more than the old-style connectors, but are worth every penny. You don’t need to crank the nut very tight for an effective seal. Just thread it finger-tight and then add about a half-turn with a wrench. So save yourself headaches and replace those old supply lines with braided stainless steel connectors.
Measure for the Supply Line
Many new faucets include supply lines, but they may not be long enough, or they may not have the right threads to connect to your shutoff valves. To determine the length of the supply lines you’ll need, measure from the underside of the sink near where the faucet connects to the shutoff valve and add a few inches. If the supply lines included with your new faucet aren’t long enough, buy extensions. To make sure the threads on your new supply lines match those on your shutoff valves, take one of your old supply lines with you to the store and match it with the new supply lines.