INSTALLATION OF THE FAUCET 1 New Faucet Preparation Shut off the water supply. Removes the old faucet by disconnecting the supply tubes under sink and then unscrewing the faucet from the counter top by removing the mounting nuts. Clean the sink top surface in preparation for the naw faucet, 2 Install Faucet on Sink Top Place the faucet in position on the sink top and resew nits and washers upward from under the sink onto faucet connectors.