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Sink Faucet Base Leak Repair

easyHome Repair30 min

Stop a frustrating sink leak with this step-by-step repair guide designed for homeowners and DIY enthusiasts. You will learn how to disassemble your faucet base and replace worn O-rings to ensure a watertight seal. Using a few basic tools, you can quickly resolve the leak and prevent potential water damage under your counter.

Safety Warnings

  • Turn off both hot and cold water supply valves under the sink before starting to prevent flooding.

Tools Needed

Allen wrench — size varies by brand
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Adjustable wrench — 8-inch
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Phillips #2 screwdriver — Cross-head driver for tightening and loosening screws
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Materials

O-rings — match existing size(2-3)
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Plumber's grease — silicone-based(1 tube)
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Steps

1
Shut off both the hot and cold water supply valves located beneath the sink by turning them clockwise. Test the faucet to ensure no water is flowing.
2
Remove the decorative cap on the front of the faucet handle. Use the Allen wrench to loosen the set screw and pull the handle off the top of the cartridge.
Decorative cap Set screw Cartridge Pull handle up Remove cap, loosen set screw, and lift handle off the cartridge.
3
Use an adjustable wrench to loosen the top ring (collar) of the faucet. Use a towel around the ring to protect the chrome finish from the wrench teeth.
Tip: The collar may require many turns to fully loosen.
Collar Protective towel Adjustable wrench Twist to loosen Use a towel to protect the chrome finish while loosening the collar.
4
Pull the faucet spout off and clean out the inside of the base to remove any buildup or debris accumulated from the leak.
5
Remove the old O-rings from the spout. Use a screwdriver to lift the bottom ring first, then roll it over the top one to prevent it from getting caught in the groove.
Upper ring Lower ring Screwdriver Lift and roll Remove the bottom O-ring first, then roll it over the top ring.
6
Install new O-rings by placing the first in the top groove and rolling the second into the bottom groove. Apply silicone plumber's grease to the rings to ensure a better seal and smoother movement.
Top Ring Bottom Ring Spout Base Roll into groove Install new O-rings into grooves and apply silicone grease.
7
Slide the faucet spout back into place, ensuring any internal plastic slide rings are still present. Tighten the chrome collar back down using the adjustable wrench.
Slide rings Spout Chrome collar Tighten firmly Slide the spout into place and tighten the collar with a wrench.
8
Reinstall the handle by sliding it back onto the cartridge and tightening the set screw with the Allen wrench. Replace the decorative cap.
Handle Cartridge Allen wrench Tighten set screw Slide handle onto cartridge and tighten the set screw.
9
Turn the water supply valves back on and test the faucet for leaks while swiveling the spout back and forth.
10
If the leak persists after replacing the O-rings, or if you are uncomfortable with the disassembly, call a professional plumber.

Pro Tips

  • If you are unsure of the O-ring size, take the old rings to the hardware store to ensure an exact match.

When to Call a Professional

If the sprayer hose is kinked or the diverter valve continues to leak after replacement, consult a licensed plumber.

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