With normal wear, the faucet’s seats and springs become worn, which may result in a leak from the spout. To stop the leak, simply replace the seats and springs by following these steps:

Here are some tools you may need:

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If you are not certain, you will need to find out if the hot or cold valve is causing the leak. Let's begin by troubleshooting with the hot valve:

  1. Shut off water supply.

  2. Cover drain opening so parts won’t fall into it.

  3. If you have lever handles, loosen the set screw with an Allen wrench and remove the handle. If you have knob handles, pry off the handle button, remove the screw and lift off the handle.

  4. Unscrew bonnet nut. Use a crescent wrench to loosen if necessary.

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  5. Pull stem straight up and out.

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  6. Remove seat and spring. You can lift them out with a pencil or an Allen wrench.

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  7. Wipe inside of body, including where seat and spring sit, with a soft cloth.

  8. Place new seat over new spring (Delta Genuine Part RP4993 – two sets per package)and insert into socket in body using a pencil or an Allen wrench. (Small end of spring goes into seat large end of the spring goes into the faucet body.)

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  9. IMPORTANT—STEM MUST BE REPLACED PROPERLY.

    1. Knob handle stem position: Slip the stem unit into the body, aligning the tabs on the stem with the slots in the body, so the “stop” on each stem points toward the spout.

    2. Lever handle stem position: Align the tabs on the stem with the slots in the body, so the “stop” on each stem points toward the right. If you have lever handles, you may also need to reinstall the quarter turn stops to limit the handles from turning more than 90º. Note: If you reinstall the handles and find that they aren’t turning the right direction, rotate the stem 180º and check for proper handle rotation.

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  10. Screw bonnet nut on and hand tighten.

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  11. Replace handle, tighten screw.

If the drip persists, repeat the above steps on the cold valve.

If the problem continues after you replace the seats and springs, replace both stem assemblies (Delta Genuine Part RP1740 – one stem assembly per package, or RP25513 for those requiring the quarter-turn stop)

Leaks