- 1). Clean off the sink or countertop surface where you will be installing the faucet. Use a putty knife to scrape away any old caulk or paint to give the faucet a firm footing. Clean any mold or mildew with a bathroom cleaner and old rag or towel.
- 2). Turn the faucet over so you can see the base. Roll out a bead of plumber's putty about half an inch thick and twice the length of the faucet width. Press the bead into place around the base of the faucet.
- 3). Turn the faucet right side up. Insert it into the countertop or sink so that the inlets for the hot and cold water fit into the inlets in the sink.
- 4). Move underneath the sink. Screw the plastic retaining nuts onto the underside of the faucet inlets. Tighten with a pair of pliers.
- 5). Wrap the outlets on the water supply valves and the inlets on the underside of the sink with plumber's tape. Use scissors to trim off the excess.
- 6). Connect one end of a water supply line to the hot water supply valve. Connect the other end of the supply line to the inlet on the underside of the faucet. Make sure that you are connecting the line to the hot water supply faucet tap. Repeat the process for the cold water supply line.
- 7). Insert the tube of caulk into a caulk gun. Use a sharp utility knife or scissors to trim off the end of the tube at a 45-degree angle. Hold the edge of the nozzle adjacent to the base of the faucet and work your way around the faucet base.
- 8). Allow the caulk time to cure. Turn on the water supply valves. Run the faucet. Check the hoses underneath for leaks. Tighten the couplings if you spot any leaks.
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