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If your plughole is leaking or badly stained, learning how to replace a kitchen sink drain is a practical DIY skill. With over 20 years of fitting sinks across the UK, we have seen how a simple swap can refresh your sink and prevent water damage to your cupboards.
Can you replace a kitchen sink drain yourself?
Yes. Most homeowners can manage how to replace a kitchen sink drain with a few tools and a new waste fitting. It is a straightforward job if you take your time and seal everything correctly.
Tools and parts you will need
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Adjustable spanner and screwdriver
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Plumber’s putty or silicone sealant
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PTFE tape
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Bucket and sponge
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Replacement drain kit
Browse complete sets in Kitchen Sinks with Waste Kit or individual parts in Basket Strainer Waste with Overflow.
Step 1. Disconnect the old waste
Turn off the tap and place a bucket under the sink trap.
Unscrew the trap connections and let water drain into the bucket.
Loosen the large nut holding the waste fitting to the underside of the sink.
Step 2. Remove the old drain fitting
Push the strainer or plug fitting up through the sink hole.
Clean away old putty or sealant so the new fitting sits flush.
Step 3. Fit the new waste
Roll plumber’s putty or apply sealant under the lip of the new drain.
Insert it into the hole from above.
From below, secure the rubber washer and backnut, tightening evenly.
Step 4. Reconnect the trap
Refit the U-bend or bottle trap to the new waste outlet.
Wrap threads with PTFE tape for a watertight seal.
Step 5. Test for leaks
Run water into the sink while checking every joint with a dry cloth.
If you notice drips, tighten gently and retest.
For further troubleshooting, see Why Does My Kitchen Sink Block? and maintenance tips in How to Keep a Waste Disposal Unit Clean and Free from Smell.
When to call a professional
If your sink is cracked, the worktop cut-out is damaged or your trap system is very old, a professional installer may be the safer choice. For regulations and approved fitters, check the Water Regulations Advisory Scheme (WRAS) or WaterSafe.
Final thoughts on how to replace a kitchen sink drain
With a few basic tools, most homeowners can confidently learn how to replace a kitchen sink drain. A new fitting not only prevents leaks but also keeps your kitchen fresh and functional.
