Before You Shop If you're replacing the faucet in your existing sink, look underneath the sink to see how many holes it has - usually between 1 and 4. This determines the type of faucet that will work with your sink. A one-hole faucet can be installed in a 3- or 4-hole sink by adding a deck plate, but not vice versa. Remove the Old Faucet Removing the existing faucet isn't difficult, but you will need a basin wrench and an extra set of hands. Step 1 Turn off the water valves under the sink. Turn on the faucet to relieve pressure in the lines. Turn off power to the disposal, if applicable. Step 2 Snap a picture of the plumbing configuration before disconnecting to use as a reference later. Step 3 disconnecting faucet supply lines with a wrench Use a small bucket under the connections to catch water as you disconnect supply lines. Step 4 Underside of sink showing the nuts to loosen for faucet replacement Have someone hold the faucet in place from above the cabinet, while you use a basin wrench to loosen and remove the nuts holding the faucet. Step 5 Removing old faucet from the sink Remove the faucet and clean grime and / or sealant from the sink's surface. Install the New Faucet Now that you've removed the old faucet, it's time to install the new one. Caution Because all faucets are different, defer to the manufacturer's installation instructions. Step 1 Placing deck plate over gaskets in faucet installation Place the rubber or plastic gasket, or trim ring, over the faucet holes in the sink and set the deck plate. Refer to the manufacturer's instructions regarding the use of caulk or plumber's putty in gasket installation. Step 2 Running the lines through the holes for new faucet installation Feed faucet lines into the hole(s). Step 3 Using a wrench to tighten base nuts underneath the sink Install washers and nuts underneath the sink. If you used caulk or plumber's putty for the gasket / trim ring installation, wipe away excess underneath the sink. Step 4 Pull-down weight hanging fre If your home kitchen faucet is a filter kitchen faucet, click the videos for the installation .