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- Also known as a washer-type or stem faucet.
- When the spindle is turned down, the washer or disk attached to its lower end is pressed tightly against a smoothly finished ring or ground-seat that surrounds the flow opening to shut off the water flow. If the washer and seat do not make a firm contact at all points, water will leak. This usually happens when the washer becomes worn.
- Seats in faucets that are not removable may be reground with reseating tools.