If a compression faucet still drips after a new washer, the brass seat is usually damaged. Use a seat wrench such as the LASCO 13-2111 set to unscrew a replaceable seat, or a seat dresser such as the LASCO 13-1065 or Steelman 61205 to cut a fixed seat smooth. Match the wrench tip to the square or hex socket in the seat.
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This guide covers stem-and-washer (compression) faucets, hose bibbs and sillcocks, not cartridge faucets.
Seat tools compared
| Tool | Job | Choose it when |
|---|---|---|
| LASCO 13-2111 seat removal set | Unscrews and installs replaceable seats | The seat has a square or hex socket and you plan to replace it |
| LASCO 13-1065 seat grinder/reseater | Cuts a damaged seat flat again | The seat is nicked but not removable, or no replacement seat is available |
| Steelman 61205 reseater kit | Cuts the seat flat with three cutter sizes and a depth stop | You service several faucet sizes, including hose bibbs and sillcocks |
A seat wrench removes the seat. A seat dresser (also called a reseater or seat grinder) leaves the seat in place and cuts it smooth. Many plumbers carry both, because some seats are replaceable and some are part of the faucet body.
Why compression faucets keep dripping after a new washer
In a compression faucet, the stem presses a rubber washer down onto a brass seat. If the seat is cut or grooved, a new washer cannot seal against it and the drip comes back.
The USDA’s Simple Plumbing Repairs bulletin (gutenberg.org) describes exactly this: a worn washer, constant leakage and grit cut, nick and groove the seat, and it happens more often on hot-water faucets. Its fix is regrinding or squaring the seat with a simple seat dressing tool, which it says saves buying new faucets.
So when you replace a washer, look at the seat. Shine a flashlight into the faucet body; a smooth, even ring is fine, while pits, a groove or a flattened edge mean the seat needs work.
LASCO 13-2111: seat removal set with ratchet
Choose LASCO 13-2111 when the faucet has a replaceable seat with a square or hex hole in the middle. The maker description on its Amazon listing calls it a three-piece straight seat wrench set with a ratchet, for hard-to-reach seats in faucets and ballcocks.
Push the tip that matches the seat’s socket all the way in before turning; a tip that only catches the top edge rounds the socket out. Turn counterclockwise to remove. Take the old seat to the store or match it by brand and thread, since faucet makers use different seat threads.
On October 15, 2026, the standard new offer sold by Amazon.com showed limited stock with model and manufacturer part 13-2111.
Skip it if the seat has no socket (it is machined into the body); use a reseater instead.
Check LASCO 13-2111 seat removal set on Amazon →
LASCO 13-1065: seat grinder for seats that stay in
Choose LASCO 13-1065 when the seat is damaged but cannot be removed, or when a replacement seat is not available. The maker description on its Amazon listing lists a reseater/grinder with seat dresser cutters, a guide cone, washers and screws.
The guide holds the cutter centered over the seat. Turn it a few times with light, even pressure, check the seat, and stop as soon as the ring is smooth. Each pass removes brass, so cut only what you need.
Afterward, flush the faucet before reinstalling the stem; the USDA bulletin says to shake out the cuttings and run water to wash out the rest.
On October 15, 2026, the standard new offer from a third-party seller showed stock with model and manufacturer part 13-1065.
Check LASCO 13-1065 seat grinder on Amazon →
Steelman 61205: reseater kit with three cutters
Choose Steelman 61205 if you work on several faucet sizes. Steelman’s product page (steelmantools.com) lists three flat steel cutters (1/2, 9/16 and 5/8 inch), an adjustable depth stop for different seat depths, two faucet washers and a handle.
The depth stop is the useful part for outdoor hose bibbs and long sillcocks, where the seat sits deep in the body. Pick the cutter that covers the whole seat ring and still fits inside the faucet body.
On October 15, 2026, the standard new offer from a third-party seller showed stock with model and part number 61205.
Before dressing the seat in a frost-free sillcock, check whether the maker sells a repair kit for that model. See our Woodford repair kit guide.
Check Steelman 61205 reseater kit on Amazon →
Square, hex and stepped seats
Replaceable seats have a socket in the center. Square and hex are the common shapes, and the size varies by brand. Some seat wrenches are stepped or tapered so one tip fits several sizes.
Look into the seat with a light before buying. If you can see the socket shape, match it. If you cannot tell, a set with several tips is the safer buy.
A seat that has been in place for decades can be stuck. Give penetrating oil time to work, keep the wrench square to the seat, and turn steadily. Our penetrating oil guide covers the options.
Remove or dress: how to decide
Replace the seat when it is removable and you can get an exact match; a new seat gives a fresh sealing surface. Dress the seat when it is part of the body, when it will not come out, or when no match is available.
Stop and consider replacing the faucet if the seat is cracked, if dressing would cut through to the threads, or if parts for that faucet are no longer sold.
When installing a new seat, start it by hand so the threads do not cross, then snug it with the seat wrench. Overtightening can damage the faucet body.
Before you start
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Shut off the water to the faucet and open it to relieve pressure. Have a new washer and screw that match the stem, and plumber’s grease for the stem threads.
Protect the finish on the cap nut with a cloth under the wrench jaws. If the faucet is a cartridge or ceramic-disc type rather than compression, these seat tools do not apply; see our cartridge replacement guide.
After reassembly, open the shutoff slowly and check for drips at the spout and around the stem.
Frequently asked questions
What is a faucet seat wrench used for?
It unscrews and installs the replaceable brass seat inside a compression faucet. The tip fits a square or hex socket in the center of the seat.
What is the difference between a seat wrench and a seat dresser?
A seat wrench removes the seat. A seat dresser, also called a reseater or seat grinder, leaves the seat in place and cuts its sealing surface smooth again.
Why does my faucet still drip after a new washer?
The seat is often cut or grooved, so the new washer cannot seal. Replace the seat if it is removable, or dress it smooth if it is not.
Do seat wrenches work on cartridge faucets?
No. Cartridge and ceramic-disc faucets seal differently. Seat tools are for compression faucets, hose bibbs and similar stem-and-washer valves.
Can I dress a seat more than once?
Each dressing removes brass. Cut only until the ring is smooth, and replace the seat or faucet if the seat gets too thin or cracks.
How we chose
This is a document-based guide with no hands-on testing claim. We used the maker descriptions shown on the Amazon listings for the LASCO tools (the maker’s own site could not be reached), Steelman’s product page and the USDA plumbing-repair bulletin. On October 15, 2026, all three linked standard new offers showed stock and matched their model and part numbers. Read our selection method and about Plumbing Picks.
Primary sources
- USDA Farmers’ Bulletin 1460, Simple Plumbing Repairs in the Home (gutenberg.org): seat wear on compression faucets and seat dressing; public-domain historical text.
- Steelman 61205 product page (steelmantools.com): three cutter sizes, depth stop, included washers.