How to Repair a Leaky Delta Faucet

By
Aaron Stickley
Aaron Stickley

Aaron Stickley is a licensed plumber with 15 years of experience in commercial, new residential plumbing, and residential service and repair. He started his own residential service and repair plumbing business. Aaron's articles about plumbing on The Spruce span four years.

Learn more about The Spruce's Editorial Process
Updated on 01/09/24
Reviewed by
Richard Epstein
Richard Epstein
Reviewed by Richard Epstein
Richard Epstein is a licensed master plumber with over 40 years experience in residential and commercial plumbing. He specializes in estimating as well as design and engineering for plumbing systems, and he works for one of New York's largest union plumbing construction companies.
Learn more about The Spruce's Review Board
Leaky Delta faucet handle being turned

The Spruce / Kevin Norris

In This Article
Project Overview
  • Working Time: 30 mins
  • Total Time: 30 mins
  • Skill Level: Beginner
  • Estimated Cost: $5 to $15

Delta bathroom and kitchen faucets with two handles are often stem-style faucets that include a neoprene valve seat and spring that fits into the faucet below a cartridge-like insert stem. This is different from a true cartridge-style faucet, which closely resembles a stem faucet but does not have valve seats and springs.

With a stem-style faucet, a neoprene valve seat and spring fit into the water inlet port in the valve body. Over the valve seat and spring, the stem is held into the body with a bonnet nut; the handle then fits onto the top of the stem.

Leaks in this type of faucet can usually be fixed with a new neoprene valve seat and spring. However, you may also need to replace the entire stem if the handle is stiff when turning on the faucet, if there is a leak around the handle when the faucet is turned on, or if replacing the seat and spring doesn’t stop the leak.

What is Delta's Lifetime Warranty Policy?

Delta's Lifetime Warranty Policy states that "all parts and finishes of Delta faucets purchased from authorized Delta sellers are warranted to the original consumer purchaser to be free from defects in material and workmanship for as long as the original consumer purchaser owns the home in which the faucet was first installed." Delta will repair or replace the product, free of charge, during the applicable warranty period. Proof of purchase (original sales receipt) from the original purchaser must be shown to Delta for all warranty claims.

Before You Begin

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. No matter which valve wears out quicker, many people choose to replace both valves at the same time.

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.

Tip

According to the Delta website, you can find your model number by looking at the model identification tag that is located on the faucet's supply line.

What You'll Need

Equipment / Tools

  • Tongue-and-groove pliers or adjustable wrench
  • Screwdriver or Allen wrench

Materials

  • New rubber seat and spring (one set for each handle)
  • Plumber's grease
  • Replacement stem (as needed)

Instructions

Materials and tools to repair leak of Delta faucet

The Spruce / Kevin Norris

How to Repair a Leaky Delta Faucet

  1. Remove the Faucet Handle

    Loosen the faucet handle, using either a screwdriver to remove the screw on top of the handle or an Allen wrench to remove a setscrew on the side of the handle. You may need to remove a decorative cap from the top of the handle to access the handle screw.

    Lift the handle straight up to remove it from the faucet stem.

    Delta faucet handle being removed from screw on sink deck

    The Spruce / Kevin Norris

  2. Remove the Bonnet Nut

    Loosen the bonnet nut securing the faucet stem. Use tongue-and-groove pliers or an adjustable wrench to turn the nut counterclockwise. Unthread the nut completely and remove it from the stem.

    Bonnet nut removed from Delta faucet stem with adjustable wrench

    The Spruce / Kevin Norris

  3. Remove the Stem

    Note the position of the stem before removing it. You must reinstall it in exactly the same position for the faucet to work properly. Stems usually have one or more tabs that fit into notches in the stem housing to help you align the stem, but you can still get the stem backward. It might be helpful to take a photo of the stem for reference.

    Remove the stem by pulling it straight up and out of its housing. Use pliers, if necessary, gripping just the spindle at the top of the stem.

    Delta faucet stem removed by pulling out of housing

    The Spruce / Kevin Norris

  4. Remove the Valve Seat and Spring

    Look inside the stem housing and locate the neoprene valve seat in a hole at the bottom of the faucet housing. The valve seat is a small, black, rubber cap with a hole in the top. Sitting inside and below the seat is a small metal spring. Remove the seat and spring by inserting a small screwdriver or Allen wrench into the hole of the seat and pulling up both parts together.

    Note the spring's orientation inside the valve seat. The spring should be slightly larger in diameter at the bottom than at the top—where it fits into the seat. You must install the new spring and seat with the same orientation.

    Neoprene valve seat removed from bottom of faucet housing with screwdriver

    The Spruce / Kevin Norris

  5. Install a New Seat and Spring

    Fit the new seat and spring onto the end of a screwdriver or Allen wrench in the same position as the original seat and spring. Use the screwdriver or wrench to guide the spring and seat into the hole in the stem housing. They must fit all the way down into the hole. Remove the screwdriver or wrench and confirm the valve seat is positioned properly.

    New seat and spring on screwdriver end to place in stem housing

    The Spruce / Kevin Norris

  6. Reinstall the Stem

    Apply a small amount of plumber's grease to the O-ring at the base of the valve stem. If desired, you can also replace the O-ring (which is sometimes included with stem-and-spring kits) or the entire stem. Fit the stem into its housing, aligning the tabs on the stem with the slots in the housing. Push the stem all the way down until it stops.

    Reinstall the bonnet nut and tighten it carefully with pliers or an adjustable wrench. Do not overtighten the nut, which can damage the stem housing.

    Plumber's grease applied to valve stem base for stem reinstallation

    The Spruce / Kevin Norris

  7. Check for Leaking and Reinstall the Handle

    Turn the water supply back on by opening the shutoff valve (under the sink) counterclockwise all the way until it stops or by turning the water back on at the main. Check for leaks around the faucet stem. If it leaks, tighten the bonnet nut until the leaking stops; again, be careful not to overtighten.

    Fit the handle onto the stem and secure it with the screw or setscrew.

    Stem tightened back on faucet for testing handle

    The Spruce / Kevin Norris

When to Call a Professional

If you are not handy or not confident in your ability to repair or temporarily fix a leaky faucet, you should consider bringing in help. If the leaking faucet has caused more damage to other parts of the area, or there may be an underlying issue, you should call a professional to help remedy the situation.