Mixing faucets, which are found on sinks, laundry trays, and bathtubs, are actually two separate units with a common spout. Each unit is independently repaired.
Dripping faucets are the most common plumbing problem. Normally a new washer is all that is required. If water leaks around the stem, either the packing is loose or needs replacing. To repair the faucet, first shut off the water at the shutoff valve nearest the particular faucet.
Disassemble the faucet by removing the handle, packing nut, packing, and stem in that order. You may have to set the handle back on the stem and use it to unscrew and remove the stem.
Remove the screw and worn washer from the stem. Clean the washer cup and install a new washer of the proper size and type.
Reassemble the faucet. Handles of mixing faucets should be in matched positions.
If a washer requires frequent replacement, it may be the wrong type or the seat may be rough and scoring the washer. Flat washers are used on seats having a crown or round ridge for the washer seat. Tapered or rounded washers are used with tapered seats. These seats may be replaced if worn or damaged.
Replaceable seats have either a square or hex shaped water passage for the seat removal tool. Seat dressing tools are available for non-replaceable seats.
Occasionally a faucet will be noisy when water is flowing. This may be due to a loose washer or worn threads on the stem and receiver, permitting the stem to vibrate or chatter. Pressing down on the handle will stop stem vibration but will not affect a loose washer.
