If your bathroom sink drain is leaking, corroded, or outdated, replacing it is one of the easiest DIY plumbing upgrades you can do—and it usually takes less than 30 minutes. This guide shows you exactly how to remove an old drain, install a new one, and eliminate leaks, while also helping you pick the right replacement parts.

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Quick Fix Summary Table (Replace a Bathroom Sink Drain)

Problem	Most Likely Cause	Quickest Fix	Difficulty	Time	Recommended Parts
Drain leaking under sink	Loose or cracked drain assembly	Replace drain body + seal	Easy	20–30 min	Recommended Drain Assemblies (Metal, Pop-Up, Push-Down)
Slow draining after installation	Misaligned or trapped pivot rod	Adjust rod + clear stopper	Easy	5–10 min	Universal Pop-Up Repair Kit
Drain rusted or corroded	Old metal drain	Replace with PVC/metal combo	Easy	20–30 min	Rust-Proof Sink Drain Kit
Stopper no longer moves	Broken pivot rod or stopper	Replace stopper assembly	Easy	10–15 min	Universal Stopper Assembly
Water pooling around sink	Worn plumber’s putty or gasket	Reseal with putty	Easy	5–10 min	Plumber’s Putty

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Tools & Parts You Need

Tools

Adjustable wrench
Channel-lock pliers
Plumber’s putty (or silicone for some drain types)
Bucket or bowl (to catch water)
Towel or rag

Replacement Parts

Best Standard Drain Assembly: Metal pop-up drain kit (works with most sinks)
Best Push-Down Drain: Click-clack (“push-to-close”) drain assembly
Best Budget Drain: PVC drain with stopper
Sealant: Oatey plumber’s putty
Universal Pop-Up Repair Kit for worn pivot rods

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Before You Begin: Identify Your Drain Type

Bathroom drains fall into three main categories:

Pop-Up Drain (with pivot rod connected to lift rod — most common)
Grid Drain (no stopper; found in guest baths)
Push-Down Drain (click-clack style that you press to open/close)

This guide focuses on pop-up drains, but includes notes for all types.

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Step-by-Step: How to Replace a Bathroom Sink Drain

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STEP 1 — Remove Items Under the Sink

You’ll need room to maneuver. Place a bowl under the P-trap to catch any water.

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STEP 2 — Disconnect the Pivot Rod

Find the pivot rod at the back of the drainpipe.
Unscrew the retaining nut (small nut holding the rod to the drain).
Pull out the pivot rod.
Remove the old stopper from inside the sink.

Troubleshooting:
If the pivot rod is stuck, loosen with channel locks and wiggle it out.

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STEP 3 — Remove the P-Trap

Loosen the two slip nuts on the P-trap.
Lower the trap carefully—water will spill.
Set the P-trap aside.

Pro Tip: Now is a great time to clean hair/debris out of the trap.

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STEP 4 — Unscrew the Old Drain Assembly

Inside the sink, hold the drain flange with one hand.
Under the sink, loosen the large lock nut holding the drain assembly.
Remove the old drain body from underneath.
Lift the top flange out from above the sink.

If it’s stuck:
Tap gently with your hand or wiggle until it releases.

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STEP 5 — Prepare the New Drain (Plumber’s Putty)

For metal drains:

Roll plumber’s putty into a rope and apply it under the flange.

For plastic drains:

Most require no putty—use the included rubber gasket instead.

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STEP 6 — Install the New Drain Body

Insert the new drain body up through the sink from underneath.
Place the flange on top and hold it still.
From below, install the rubber gasket, friction ring, and lock nut.
Tighten the lock nut until snug, but don’t overtighten.

Wipe away excess putty squeezed out around the flange.

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STEP 7 — Reconnect the Pivot Rod (Pop-Up Drains Only)

Insert the stopper back into the sink.
Align the hole in the stopper with the pivot rod.
Insert the pivot rod into the drain and tighten the retaining nut.

Test it: Pull the lift rod.
If the stopper doesn’t move, adjust the pivot rod position.

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STEP 8 — Reattach the P-Trap

Reconnect the P-trap to the drain assembly and wall pipe.
Hand-tighten slip nuts, then give a quarter-turn with pliers.

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STEP 9 — Test for Leaks

Run water for 2–3 minutes.

Check these areas:

Under the flange
Around the lock nut
Pivot rod retaining nut
P-trap connections

If leaking → tighten slightly or reapply plumber’s putty.

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Common Problems & How to Fix Them (Post-Installation)

1. Water leaks around the top flange

Cause: Not enough putty
Fix: Remove flange → reseal with new plumber’s putty

2. Stopper won’t stay down or won’t pop up

Cause: Pivot rod misaligned
Fix: Adjust rod → tighten nut → test again

3. Slow draining after install

Cause: Stopper sitting too low
Fix: Raise stopper position by adjusting pivot rod

4. Drips from P-trap

Cause: Cross-threaded slip nut
Fix: Re-seat washer and tighten

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Best Replacement Bathroom Sink Drains (Buying Guide)

1. Best Overall Pop-Up Drain

Metal body
Integrated stopper
Easy fit for most sinks

2. Best Push-Down Drain (Modern Look)

No pivot rod
Clean, simple design
Great for vessel sinks

3. Best Budget Drain

PVC body
Comes with gasket
Leak-proof and low cost

4. Universal Stopper Repair Kit

Fixes 90% of non-moving pop-ups
Great upsell item

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When to Call a Plumber Instead

Call a pro if:

Your sink drain is welded or fused in place
The drain pipe is cracked or corroded
You notice water damage in the vanity
The sink is an under-mount with a fragile seal

Most homeowners can do this themselves—but know when to call for backup.

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Final Takeaway

Replacing a bathroom sink drain is an easy, low-cost project that:

Stops leaks
Updates your bathroom
Improves drainage
Boosts home value

With the right drain assembly and a bit of plumber’s putty, you can finish this job in under 30 minutes.

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