Tap Leaking Under Sink

Quick answer

First, turn off the water supply under the sink. Place a bucket to collect water. Use a wrench to tighten any loose connections. If the leak persists, you may need to replace the washers or the entire tap cartridge.

Confirm the symptom

• Water dripping or pooling under the sink
• Leak when the tap is turned on or off
• Water damage or mold under the sink
• Dripping sound coming from under the sink

Tools and prep

• Adjustable wrench
• Screwdriver (flathead and Phillips)
• Bucket and towels
• Replacement washers or O-rings
• Plumber's grease or silicone sealant
• Turn off water supply under the sink
• Ensure the sink area is dry and well-lit

Step-by-step troubleshooting

1. Turn Off Water Supply
   Do: Locate the water valves under the sink and turn them clockwise to shut off the water supply.
   Observe: No water should flow from the tap.
   Means: Water is successfully shut off.
   Next: Proceed to the next step.
2. Prepare the Area
   Do: Place a bucket under the pipes to catch any remaining water. Lay down towels to absorb spills.
   Observe: Area is dry and prepared.
   Means: Ready to work on the pipes.
   Next: Inspect the pipes and connections.
3. Inspect Pipes and Connections
   Do: Check for any loose or damaged connections. Tighten any loose fittings using an adjustable wrench.
   Observe: Tighten connections until snug, but do not overtighten.
   Means: Connections are secure.
   Next: Check for leaks.
4. Check for Leaks
   Do: Turn the water supply back on and observe the area for leaks.
   Observe: No leaks should be present.
   Means: The leak is fixed.
   Next: If the leak persists, proceed to the next step.
5. Replace Washers or O-Rings
   Do: Disassemble the tap to access the washers or O-rings. Replace any worn-out parts with new ones.
   Observe: Ensure the new parts are properly seated.
   Means: Washers or O-rings are replaced.
   Next: Reassemble the tap.
6. Reassemble the Tap
   Do: Put the tap back together, ensuring all parts are securely in place.
   Observe: The tap functions properly without leaks.
   Means: The tap is reassembled correctly.
   Next: Test the tap.
7. Test the Tap
   Do: Turn the water supply back on and test the tap for leaks.
   Observe: No leaks should be present.
   Means: The repair is successful.
   Next: Clean up the area.
8. Clean Up
   Do: Remove any towels and buckets. Wipe down the area to ensure it is clean and dry.
   Observe: The area is clean and dry.
   Means: The repair is complete.
   Next: None

Common causes

Parts matching

The following parts are commonly needed to fix a tap leaking under the sink.

• Replacement washers
• O-rings
• Plumber's grease or silicone sealant
• Adjustable wrench
• Screwdriver set
• Tap cartridge
• Pipe wrench

Always ensure you have the correct replacement parts before starting the repair.

When to call a professional

• If the leak is severe and causing significant water damage
• If you are unsure about any part of the repair process
• If the tap is old and frequently leaking
• If the leak persists after attempting repairs
• If you notice corrosion or damage to the pipes
• If you are not comfortable working with plumbing

FAQ

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