Step 3 · Remove the Old Faucet
Using the basin wrench, locate and loosen the mounting nuts that secure the old faucet body to the underside of the sink. These can be plastic or metal and are often corroded and difficult to remove. If there is a separate side sprayer, you will also need to disconnect its hose from the main faucet body and unscrew the nut holding its base in place. Once all nuts are removed, the old faucet assembly should be free to be lifted straight up and out from the top of the sink.