To install a Moen faucet, turn off the water supply, detach the supply pipes, and remove the old faucet. Then, coat the base of the Moen faucet with plumber's putty, position it over the sink, and fix it in place. Reconnect the supply pipes to the stems of the faucet and water stops. Finally, restore the water supply, and test for proper installation.
Begin installing a Moen faucet by turning off the water stops beneath the sink. Using an adjustable wrench, unscrew the supply pipes from the water stops and the stems of the faucet. To remove the old faucet, remove the nuts on the stems with a basin wrench, and pull the faucet away from the top of the sink.
Clean the faucet area by scraping away any debris and wiping with a suitable solvent. After coating the Moen faucet's underside with plumber's putty, position it evenly on the top of the sink, and push its stems through the appropriate holes. Using a basin wrench, tighten the stems' nuts. Avoid over-tightening.
With an adjustable wrench, reattach the supply pipes to the faucet stems and water stops snugly without over-tightening. Restore the water supply by turning the water stops on. Check for any leaks from the pipe nuts, and tighten the nuts until the leakage stops. Finally, remove any excess plumber's putty.