Turn the valves that connect to the washing machine supply hoses counterclockwise to shut off the water. Adjust slip-joint pliers to the fitting on the water supply hoses where they attach to the washing machine valves. Loosen the cold water fitting by turning it counterclockwise with the pliers.
Remove the hose fitting from the hose bib. Inside the fitting is a rubber washer. Keep the hose fitting end turned up when removing it to prevent losing the washer.
Look inside the Oatey Quiet Pipe hose fitting for the rubber washer. Install the rubber washer if it has come out. The washer fits inside the fitting against the base. Place the Oatey Quiet Pipe on the hose bib and turn the fitting clockwise until it is hand tight.
Tighten the hose fitting on the Quiet Pipe one-quarter turn clockwise with the slip-joint pliers. Place the washing machine hose fitting on the Quiet Pipe fitting and turn it clockwise until it is tight. Tighten the fitting one-quarter turn with the slip-joint pliers.
Turn the hose bib valve clockwise to turn the water on. Observe the fittings for leaks and tighten them with the slip-joint pliers if necessary.