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Repair a Leaky Delta Faucet
Delta bathroom and kitchen faucets with two handles often are stem-style faucets that include a seat and spring under each handle. This is different from a cartridge-style faucet, which has a stem-like cartridge but does not have seats and springs. The seat and spring sits below each stem, inside the faucet body. The stem is held into the body with a bonnet nut, and the handle fits onto the stem.
Leaks in this type of faucet usually can be fixed with a new rubber seat and spring. However, you may need to replace the stem if the handle is stiff when turning on the faucet, if there is a leak around the handle when the faucet is on, or if replacing the seat and spring doesn’t stop the leak.
- Tongue-and-groove pliers or adjustable wrench
- Screwdriver or Allen wrench
- New rubber seat and spring (one set for each handle)
- Plumber's grease
- Replacement stem (as needed)
Determine Which Side Is Leaking
Place your hand under the drip from the faucet. If the water is warm, the leak is most likely on the hot side of the faucet. If the water is cold, the leak is most likely on the cold side. This tells you which is the better side to fix first, but it's possible that both sides are leaking in any case.
Look under the sink to locate the shutoff valve on the side of the faucet you will work on (hot or cold). The valve may have a small football-shaped handle or a lever or knob. Turn the handle clockwise until it stops. Open the hot or cold faucet, as appropriate, to make sure the water is off.
If there are no shutoff valves under the sink, turn off the water to the entire house at the home's main shutoff valve, then turn on both sides of the faucet to relieve pressure in the supply lines.
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