Slotted or unslotted — get this wrong and it leaks · review
A 2.60 in (66 mm) brass click-clack plug cap for a 1.42 to 1.50 in (36 to 38 mm) drain hole, fitting a standard M8 bolt.
Package Includes: 1 piece sink button, pop up plug bolt not include.
Six listings here sell three different things, and this is the only one that spells out what is not in the box.
Complete assemblies: Kraus $34.95, Kohler $99.99. Caps only: this, and the FASTROHY at $9.66 for two. Bolts only: UXELY $7.79, ALI2 $9.99 for two.
A click-clack drain fails in one half or the other. Push the cap: if it still latches but looks ruined, you want a cap. If it has stopped latching, you want a bolt.
They unscrew from each other at the M8 thread — which this listing also names, so a Tong Gu cap goes straight onto a UXELY or ALI2 bolt.
The only drain hole figure on this shelf, and the number that answers the real question in one step.
A cap has to cover the outlet and sit on the rim of the drain body. Thirty-six to thirty-eight millimeters is the common bathroom sink drilling, and a 2.60 in (66 mm) cap over it leaves a sensible overlap all round.
If your sink is drilled larger — and some vessel sinks are 1.77 in (45 mm) or more — a 2.60 in (66 mm) cap can end up sitting inside the hole rather than across it, which is not a seal at all.
No other listing here publishes the hole it is made for. FASTROHY publishes a cap diameter and a screw hole and tells you to measure; this publishes the thing you would be measuring against.
$7.99 for one brass cap. The FASTROHY pack is $9.66 for two in zinc alloy — $4.83 each.
Zinc alloy plates beautifully and pits in standing water. Because chrome is a plating rather than the metal itself, a pit lifts the chrome around it, and one small blemish becomes a spreading gray patch.
Brass corrodes far more slowly and does not undermine its own finish the same way.
So the honest division: for a guest bathroom nobody looks at, buy the zinc pair and fit the second one in a few years. For the sink you use every morning, buy the brass.
Tong Gu publishes 2.60 in (66 mm). The Kraus cap is 2 5/8 inches, which is 66.7. FASTROHY says 66 in its title and 65 in its bullets.
So anything between 65 and 67 is the click-clack norm. Measure the old cap across the top; if it is nothing like that, none of the caps on this shelf is the part.
No height, which is the one figure that would let you match this cap to an existing bolt with certainty. The UXELY bolt here publishes three heights; neither cap publishes one.
No warranty. On this shelf, only the Kraus, at one year, publishes one.
And the five bullets and the description are the same five sentences, twice.
Available at around $7.99 on Amazon.com when we checked on October 29, 2026, for delivery to a US address.
Stock and prices on Amazon.com move without notice; the button above opens the live listing.
Prices quoted in this text were read on October 29, 2026. The live price is at the top of the page.
| Thread size | A nominal 1/3 in (8 mm) screw — the M8 standard — stated to fit a standard M8 pop up plug bolt. THE VISIBLE CAP ONLY, and the maker states explicitly that THE BOLT IS NOT INCLUDED. One piece at $7.99 on October 29, 2026, against $4.83 each for the zinc alloy pair on this shelf. 2.6 in / 66 mm diameter, 2.60 × 2.60 × 2.60 in (66 × 66 × 66 mm). |
|---|---|
| Slotted or unslotted | NOT PUBLISHED as such, but it is the ONLY PART ON THIS SHELF THAT PUBLISHES THE DRAIN HOLE IT SUITS: 1.4 to 1.5 in / 1.42 to 1.50 in (36 to 38 mm). That one figure is what the other cap here leaves you to guess. |
| Operating mechanism | NONE — it is a cap, driven by the bolt you supply. |
| Height under the sink | NOT PUBLISHED BY THE MAKER. |
| Material and finish | Silver on HIGH-QUALITY BRASS — the only brass cap on this shelf. No weight and no warranty are published. The maker undertakes to reply within 24 hours. |
| Amazon reference | B095RKRXT9 |
| EAN | 0781111245367 |
Because the cap has to cover the hole and sit on the rim of the drain body, and sink outlets are not all the same. Thirty-six to thirty-eight millimeters is the common bathroom sink drilling, and a 2.60 in (66 mm) cap over it leaves a sensible overlap all round. If your sink is drilled larger — some vessel sinks are 1.77 in (45 mm) or more — a 2.60 in (66 mm) cap may sit inside the hole rather than over it, which is not a seal at all. Tong Gu is the only listing on this shelf that publishes the hole size it is designed for, and it is the number that answers "will this fit" in one step rather than three.
That depends on how long you want to leave it alone. Zinc alloy plates beautifully and pits in standing water — and because chrome is a plating, a pit lifts the chrome around it, so one blemish grows into a gray patch. Brass corrodes much more slowly and does not undermine its own finish the same way. So: $7.99 for one brass cap, or $9.66 for two zinc ones and the expectation of fitting the second in a few years. For a guest bathroom nobody looks at, the zinc pair is the sensible purchase. For the sink you use every morning, the brass one is.
Buy both, from this shelf, for about twenty dollars. Tong Gu says plainly: "Package Includes: 1 piece sink button, pop up plug bolt not include" — and then, helpfully, "fits standard M8(8 mm (0.31 in)) screw pop up plug bolt". The UXELY bolt here is $7.79 and the ALI2 pair is $9.99, both M8 top thread. So a Tong Gu cap screws straight onto either. That interchangeability is the real structure of this shelf: four small parts, one thread standard, and two halves that fail independently.
Same category, nearby prices, between bathroom fittings. What remains is the specifications every one publishes — half empty, a column is no use.
| Model | Price | Thread size | Slotted or unslotted | Operating mechanism | Height under the sink |
|---|---|---|---|---|---|
| Tong Gu brass pop-up plug cap | $8 | A nominal 1/3 in (8 mm) screw — the M8 standard — stated to fit a standard M8 pop up plug bolt. THE VISIBLE CAP ONLY, and the maker states explicitly that THE BOLT IS NOT INCLUDED. One piece at $7.99 on October 29, 2026, against $4.83 each for the zinc alloy pair on this shelf. 2.6 in / 66 mm diameter, 2.60 × 2.60 × 2.60 in (66 × 66 × 66 mm). | NOT PUBLISHED as such, but it is the ONLY PART ON THIS SHELF THAT PUBLISHES THE DRAIN HOLE IT SUITS: 1.4 to 1.5 in / 1.42 to 1.50 in (36 to 38 mm). That one figure is what the other cap here leaves you to guess. | NONE — it is a cap, driven by the bolt you supply. | NOT PUBLISHED BY THE MAKER. |
| UXELY pop-up drain bolt assembly | $8 | M8 at the top, M16 × 1.5 at the bottom — THE BOLT AND SPRING MECHANISM ONLY, and THE CAP IS NOT INCLUDED. One piece, 1.77 × 0.59 × 0.59 in (45 × 15 × 15 mm). | NOT APPLICABLE — a bolt has no slot. Whether your sink needs a slotted drain is settled by the cap, which this part does not include. | A spring mechanism with a screw thread push. | 2.30 in (58.3 mm) overall — 1.52 in (38.5 mm) popped up, 1.10 in (28 mm) closed. IT IS THE ONLY PART ON THIS SHELF THAT PUBLISHES ALL THREE, and the 0.41 in (10.5 mm) of travel is what the spring actually gives you. |
| ALI2 click-clack pop-up bolts, 2-pack | $10 | M8 at the top, M16 × 1.5 at the bottom — the same two threads as the UXELY bolt on this shelf. THE BOLT AND SPRING MECHANISM ONLY, cap not included. Two pieces at $5.00 each. | SUITED TO OVERFLOW SINKS, per the maker — which is the slotted case, and the only statement of it on this shelf among the bolt-only parts. | Push to close and seal, push again to open and drain. The maker states it collects hair neatly and prevents it clogging. | 1.10 in (28 mm) CLOSED, AND NOTHING ELSE: the popped-up height is not published, where UXELY gives 1.52 in (38.5 mm), and neither is the overall height, where UXELY gives 2.30 in (58.3 mm). So the travel — the whole point of a spring bolt — cannot be worked out from this listing. |
| FASTROHY click-clack drain plug tops | $10 | An 0.31 in (8 mm) screw hole, which is the M8 standard on this shelf — THE VISIBLE CAP ONLY, with NO MECHANISM INSIDE and no bolt included. Two pieces at $4.83 each. The diameter is published TWO WAYS: 2.60 in (66 mm) in the title and 2.56 in (65 mm) in the bullets. The maker's own advice is to measure your size before choosing. Five published bullets, two of which repeat each other. | NOT PUBLISHED, and neither is the DRAIN HOLE SIZE IT SUITS, where Tong Gu on this shelf publishes 1.42 to 1.50 in (36–38 mm) — so nothing on this listing tells you whether it will seat in your drain. | NONE — it is a cap, pushed by whatever bolt you already have. | NOT PUBLISHED BY THE MAKER. |
This model is listed on Amazon.com, at ≈ $8 at the last reading. Listed is not the same as in stock: availability changes daily, and the buy box shows the live price.
Details checked on October 29, 2026.
A cracked click-clack cap on a 1.42 to 1.50 in (36 to 38 mm) sink outlet, where brass is worth paying for
Specifications: the manufacturer sheet for bathroom fittings and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
Two clicker pop-up drains, brass · M8 top thread · the maker calls the same metal copper
A pair of brass clicker pop-up bolts with M8 and M16 x 1.5 threads and a 1.10 in (28 mm) closed height.
Best for: A click-clack drain that no longer springs — two brass mechanisms for ten dollars
≈ $10
Pack of two chrome sink drain push button click clack plug tops in high quality zinc alloy, intended as a replacement pop up click clack plug top; the title states 2.60 in (66 mm) and the bullets state a chrome plug diameter of 2.56 in (65 mm) with a screw hole diameter of 0.31 in (8 mm), and the maker advises measuring before choosing
A pair of chrome click-clack plug tops in zinc alloy, with an 0.31 in (8 mm) screw hole.
Best for: A cracked or pitted click-clack cap, where two for nine dollars means one spare in the drawer
≈ $10
Clicker drain without overflow, polished chrome · 1 1/4 in (32 mm) connection · metal build
A clicker drain without overflow, with a 1-1/4 in connection and a brass tailpiece, in polished chrome.
Best for: A Kohler sink and a Kohler faucet, where the finishes have to be the same and the paperwork has to say Kohler
≈ $100
