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Step 1
Shut off the water supply either at the stop valve or the main supply valve, depending on your house. Empty out everything beneath the sink so you can make a little more room for yourself. You are going to need it in most cases. Once you've got the working space cleared out, place your tools within easy grasp.
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Step 2
Loosen mounting nuts that attach the body of the faucet to the sink with your basin wrench. Lift the faucet out while standing above it. Scrape off the remaining vestiges of the old putty and all the mineral deposits that have accumulated from years of using the sink.
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Step 3
Squeeze plumber's putty on the bottom of the baseplate of the faucet and then set it in place. Take extra care to make sure that it is perfectly parallel to the backsplash. Get yourself into a position beneath the sink and screw a washer and mounting nut onto each inlet. You will in almost every case need someone to hold the faucet in position while you do this. Use the basin wrench to tighten the mounting nut
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Step 4
Use the basin wrench to tighten the mounting nut. Wrap the inlet threads with plumber's tape before connecting the supply lines. The supply line nut can then be twisted onto the inlet and tightened, then complete the tightening with the basin wrench.
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Step 5
Connect the other end of the supply line to the shutoff valve and then tighten. Check for leaks by turning on the water. If there are leaks, go back and retighten all screws and nuts.
