How Do I Remove an Old Tap Washer Without Wrecking the Faucet?

Learning how to remove old tap washer parts is the single most useful plumbing skill for anyone with a traditional compression tap that has started to drip. That steady drip… drip… drip… is almost never the whole tap failing — it’s a 20-cent rubber washer that has hardened, cracked, or gone lopsided from years of being crushed against a brass seat every time you turn the tap off. Replace it and the drip stops. Below, I’ll walk you through exactly how to get the old washer out cleanly, what tools you actually need, how to identify the right replacement, and when a washer swap won’t fix the problem so you don’t waste a Saturday.

Quick note before we start: this guide is for compression (washer-style) taps — the kind with separate hot and cold handles that you have to keep turning to shut off. If you have a single-lever mixer, that almost certainly uses a cartridge or ceramic disc instead of a washer, and the fix is different. If you’re not sure which you have, our explainer on what a faucet cartridge does and why it matters will help you tell them apart in about a minute.

What tools do I need to remove a tap washer, and do I need anything special?

You need almost nothing special — an adjustable wrench, a couple of screwdrivers, and a replacement washer will cover 90% of taps. This is a beginner-friendly job that doesn’t require a plumber or a call-out fee.

Here’s the full kit that gets the old washer out and a new one in without drama:

• Adjustable wrench (or a set of spanners) — to loosen the packing nut / headgear that holds the valve stem.
• Flat-head screwdriver — to pry off the old washer and, on some taps, to pop off the decorative handle cap.
• Phillips (cross-head) screwdriver — most handle screws and washer retaining screws are cross-head.
• Replacement washer — usually 1/2″ for a standard bathroom or kitchen tap, 3/4″ for a bath tap. Buy a mixed pack so you have the right size on hand.
• A cloth or old towel — to protect the chrome finish from wrench jaws and to plug the drain so screws don’t disappear.
• Penetrating oil and a little plumber’s grease — optional but handy if the tap is old and stiff.

Wrap the jaws of your wrench in cloth or electrical tape before you grip any visible chrome. Bare metal teeth will chew up a polished finish in seconds, and once you’ve scratched it there’s no easy undo — though if it does happen, our take on whether chrome touch-up paint actually works covers your options.

How do I actually get the old washer out, step by step?

Shut off the water, take the tap apart from the handle down, undo the brass screw at the base of the valve stem, and lift or pry the old washer off its seat. That’s the whole job in one sentence — here it is slowed down so nothing goes wrong.

1. Turn off the water supply. Close the isolation valve under the sink (a small in-line valve you turn with a flat screwdriver), or shut off the main stopcock if there’s no isolation valve. Then open the tap fully to drain any water left in the pipe and to relieve pressure.
2. Plug the drain. Push a cloth into the plughole. The retaining screw is tiny and loves to vanish down the drain the instant you drop it.
3. Remove the handle. Pry off the hot/cold index cap on top with a flat screwdriver, undo the screw underneath, and lift the handle off. On some taps you simply unscrew the shroud (the chrome cover) by hand or with a cloth-wrapped wrench.
4. Undo the headgear nut. With the handle off you’ll see a hexagonal brass nut — the packing nut or headgear. Grip the tap body to stop it spinning inside the sink, then loosen this nut with your wrench (counter-clockwise). Lift out the whole valve stem / spindle.
5. Find the washer. Look at the bottom of the stem. You’ll see a rubber (or sometimes fibre) washer held by a small brass nut or screw, sitting in a little cup called the jumper.
6. Remove the old washer. Undo the brass retaining screw. If it’s seized, a drop of penetrating oil and 60 seconds of patience beats snapping the screw head off. Once the screw is out, slide or pry the old washer off with a flat screwdriver. If the washer has fused to the metal, work the screwdriver under one edge and lift gently all the way around.
7. Clean the seat. Wipe the brass jumper cup clean and look down into the tap body at the valve seat — the ring the washer presses against. Any grit or limescale here will make even a brand-new washer drip.

That’s it. The removal is genuinely the easy part; the mistakes people make are almost always in choosing the wrong replacement or over-tightening on reassembly, which we’ll cover next.

What size washer do I need, and how do I match the old one?

Match the new washer to the old one by diameter and thickness — take the old washer to the store, or measure it. Standard basin and kitchen taps use a 1/2″ washer; bath taps typically use 3/4″. Getting the size right matters more than the brand.

The safest method is dead simple: bring the old washer with you and lay it on top of candidates until one matches exactly in outside diameter and thickness. If you can’t do that, measure the old washer’s diameter with a ruler or caliper. Don’t force an oversized washer into a smaller jumper cup or shave one down — a washer that’s even slightly wrong will either leak or make the tap stiff to turn.

One material tip: if the drip is on the hot tap, choose a washer rated for hot water (nitrile or a good-quality reinforced rubber). Cheap rubber on a hot line hardens and cracks faster, so you’ll be back inside the tap in a year.

Why is my tap still dripping after I replaced the washer?

If a fresh washer still drips, the valve seat is damaged — usually pitted or scaled — so the new washer can’t seal against it. Reseating the tap fixes this, and it’s the number-one reason a washer swap “doesn’t work.”

Run your fingertip (carefully) around the brass seat inside the tap body. If it feels rough, pitted, or crusted with limescale, that’s your culprit. You have two options:

• Reseat it with a tap reseating tool — a cheap hand tool that grinds the brass seat flat and smooth again. You screw it into the tap body and turn it a few times.
• Use a seating washer / domed washer — a special washer with a plastic dome that molds itself into an uneven seat, avoiding the need to grind at all. This is the fastest fix for a slightly rough seat.

Other reasons a tap keeps dripping after a washer change: the retaining screw isn’t fully tight so the washer sits crooked; the washer is the wrong thickness; or — the classic — it was never a washer problem to begin with and the tap is actually a cartridge type. If you’ve got a mixer tap that’s weeping, the pattern is different, and our guide to why a bathtub faucet drips and how to stop it for good walks through those cartridge and O-ring causes in detail. For a specific brand-name kitchen mixer, fixing a dripping Moen kitchen faucet shows the cartridge-swap version of this same repair.

How do I put the tap back together without causing a leak?

Reassemble in reverse order, tighten the headgear firmly but not brutally, and turn the tap off gently when you test it. Over-tightening is what shortens washer life, so hand-firm plus a small wrench nudge is all you want.

Walk it back together like this:

1. Seat the new washer flat in the jumper cup and tighten the retaining screw snug — firm, not gorilla-tight.
2. Smear a thin film of plumber’s grease on the stem threads and O-ring. This makes the tap turn smoothly and helps the seals last.
3. Drop the valve stem back in and tighten the headgear nut. Hold the tap body steady so you don’t twist it in the basin.
4. Refit the handle, screw, and index cap.
5. Turn the tap to the open position, then slowly restore the water supply. Opening it first prevents an air-hammer surge.
6. Test: turn it off with normal pressure. If it seals with a gentle turn, you’re done. If you have to crank it hard to stop the drip, the seat likely needs reseating (see above).

A good habit while you’re in there: replace both the washer and the O-ring on the stem at the same time. The O-ring is what stops water weeping out around the handle, and it’s a couple of cents. Doing both means you won’t be back apart in three months for the other seal.

When should I just replace the whole tap instead of the washer?

Replace the whole tap when the body is corroded, the seat is too damaged to reseat, spare parts are unavailable, or you’ve already fixed it twice this year. A washer is a $0.20 fix; chasing a failing tap over and over costs more in time than a new fixture.

Signs it’s time to stop repairing and start shopping:

• The brass body is visibly corroded, green, or cracked.
• The valve seat is so pitted that even a reseating tool won’t clean it up.
• The tap is an obsolete design and you can’t source washers or a cartridge for it.
• You’re changing the sink or worktop anyway — do it once.

If you’re upgrading, this is also the moment to consider moving from old twin-handle compression taps to a modern single-lever mixer with a ceramic cartridge, which never needs a washer again. And if your repair turned into a bigger removal job — say a stuck bath spout — the right tool makes all the difference; here’s what to know about which tub spout removal tool you actually need.

FAQ

How long does it take to remove and replace a tap washer?

About 10–20 minutes for a first-timer, and under 10 once you’ve done it before. The only thing that stretches it out is a seized retaining screw or a corroded headgear nut — a little penetrating oil and patience handles both.

Do I have to turn off the water at the mains?

Not usually. Most modern sinks have isolation valves on the supply pipes under the basin — turn those off with a flat screwdriver and you can leave the rest of the house’s water running. Only shut the main stopcock if there’s no isolation valve.

Can I remove a tap washer without any special tools?

Yes. An adjustable wrench and two screwdrivers cover the whole job. The only “special” item worth buying is a tap reseating tool, and only if you discover the valve seat is pitted after the washer swap doesn’t fully stop the drip.

Why does the retaining screw for the washer keep stripping?

It’s usually old brass, which is soft and corrodes onto the stem. Apply penetrating oil, wait a minute, use a screwdriver that fills the whole screw head, and turn with steady pressure rather than a sudden jerk. If it strips completely, you can buy a new jumper-and-washer unit for a couple of dollars and skip the screw entirely.

Is a dripping tap really caused by the washer, or could it be something else?

On a compression tap with separate hot and cold handles, a drip from the spout is a worn washer in about 90% of cases. If it’s a single-lever mixer, or water is leaking around the base of the handle rather than the spout, suspect the cartridge or O-ring instead — different part, similar-difficulty fix.

How often should a tap washer need replacing?

A quality washer that isn’t over-tightened lasts 5–10 years. If yours fails within a year or two, the likely causes are a rough valve seat chewing it up, a hot-water line eating cheap rubber, or the habit of cranking the tap off too hard. Fix the seat and use a hot-rated washer to break the cycle.

A note from the vevetta team

This guide was written and technically reviewed by the product team at vevetta, a specialist in faucets, showerheads, and bathroom fixtures. We spend our days testing tap internals — washers, jumpers, O-rings, and ceramic cartridges — for real-world durability, not just spec-sheet numbers. Our replacement seals are tested against recognized flow-and-endurance cycling standards (the kind of hot/cold pressure cycling used across the plumbing industry) and our fixtures ship with a manufacturer warranty, because a seal is only as good as the years it quietly does its job. When you’re picking a replacement washer or an upgrade tap, choose parts that meet a published standard rather than the cheapest bag on the shelf — your future self, and your water bill, will thank you.