Cover the base of the Moen faucet with a thick cloth rag and unscrew the connected head by clamping a wrench over the rag. The rag will protect the Moen faucet and the piping from being scratched by the wrenching motion. Unscrew the head in a counterclockwise motion until the faucet is disconnected from the wall.
Inspect the piping to ensure that you did not strip or damage it as you unscrewed the old shower faucet. Insert a new washer into the pipe to replace the old one. Wrap plumber’s tape around the pipe in a clockwise motion over the connection threading until you reach the opening of the pipe.
Screw the AquaSource shower faucet onto the pipe by hand and turn on the water pressure. If the new shower faucet leaks, turn off the water again and gently tighten the AquaSource faucet using the wrench and protective rag method. The faucet has been installed correctly once the fixture can process water without leaks.