Slotted or unslotted — get this wrong and it leaks · review

ALI2 click-clack pop-up bolts, 2-pack review

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.

What the maker puts in writing

“The pop-up drain plug is made of brass material, excellent finish to resist corrosion and rust”
“With M8 Top Thread - M16 Bottom Thread, easy to screw on and off. Simply push the drain cap down to close and seal, push again to open and drain”
“Not easy to clog debris, can collect hair neatly and prevent it from clogging, things will not enter the drain, can be used as a replacement part for the basin pop-up drain plug”
“M8 bottom thread: M16*1.5, closed height: 28mm (1.10 in)/1.1in, top line with spring mechanism, ideal for overflow sinks”
From the description: “Material: Copper. Quantity: 2. Top thread: M8. Bottom thread: M16x1.5. Closed height: 28mm (1.10 in)… Weight: 30 grams”

This is the mechanism, not the cap

Three different things are sold on this shelf.

Complete assemblies: Kraus $34.95, Kohler $99.99. Plug tops — the visible cap with nothing inside: FASTROHY $9.66 for two, Tong Gu $7.99. Pop-up bolts — the spring and its threaded shank, with no cap: this at $9.99 for two, UXELY at $7.79 for one.

The test is simple. Push the cap down. If it latches and releases but looks tired, the cap is the problem. If it no longer latches, or stays down, or springs straight back — the mechanism has gone, and this is the part.

The two unscrew from each other at the M8 thread.

Five dollars each, in brass

With a spare in the pack, which on a small part permanently under water is worth something.

And brass is the right metal. The FASTROHY cap on this shelf is zinc alloy, which pits in standing water and lifts its chrome where it does. A brass bolt sitting in a sink outlet does not.

The bullets say brass and the maker’s own specification says copper — brass is a copper alloy, so that is loose language rather than a different part.

“Ideal for overflow sinks” is the important clause

It means the shank is slotted, and that is the compatibility question running through this entire shelf.

A sink with an overflow has a channel in the ceramic from a hole near the rim down to the outlet, and the water from that channel has to get past the drain body into the drain. A slotted bolt and body let it through. A solid one blocks it, and the overflow stops working — which you discover the first time somebody leaves the faucet running.

The Kohler assembly on this shelf is explicitly without overflow; the Kraus is explicitly with, and names the other part number for the other case.

On a bolt, “ideal for overflow sinks” says the same thing in five words.

And the hair, presented as a feature

Can collect hair neatly and prevent it from clogging, things will not enter the drain.

That describes something real and turns it the right way up.

A click-clack shank is slotted, so water drains past it — and hair catches on the slots instead of going down the pipe. Which is the standing complaint about these drains: lift the cap and there is a tangle on the stem.

ALI2 calls it a benefit, and the argument holds. A trap full of hair is a plumber; a stem with hair on it is a tissue. Whether you agree depends on whether you would rather clean the part you can see.

Against the UXELY bolt

Same part, nearly the same money, different pages:

ALI2 — two bolts — $9.99 — M8, M16 x 1.5, closed 1.1 in (28 mm). UXELY — one bolt — $7.79 — M8, M16 x 1.5, popped up 38.5, closed 28, overall 58.3.

UXELY publishes all three heights, which is what lets you check before ordering. ALI2 publishes one and gives you a spare.

If you can measure the old bolt, buy on the figures. If not, two for ten dollars buys one attempt and one retry.

One note on weight: 1.2 oz (34 g) for two is 0.6 oz (17 g) each, where the FASTROHY caps are 1.2 oz (34 g) each. That is not a great deal of brass — these are small parts, and this is the lighter end of them.

Availability

Available at around $9.99 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.

Strengths, and the catches

Strengths

Five dollars each for a brass mechanism, with a spare in the pack — the cheapest way to fix a click-clack that has stopped latching
Publishes both threads and the closed height, which is enough to match against the one that failed
States it suits overflow sinks, which is the compatibility question the complete assemblies on this shelf turn on

Compromises

No cap included, so if the visible button is what cracked this is the wrong half
Publishes only the closed height, where the UXELY bolt publishes popped-up and overall as well
Seventeen grams each, half the weight of the FASTROHY caps, which on a brass part is not much metal

Specifications

Thread size	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.
Slotted or unslotted	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.
Operating mechanism	Push to close and seal, push again to open and drain. The maker states it collects hair neatly and prevents it clogging.
Height under the sink	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.
Material and finish	THE MATERIAL IS PUBLISHED TWO WAYS, as on the UXELY bolt: brass in the bullets, COPPER in the maker's own specification. 1.2 oz (34 g) for two, 0.6 oz (17 g) each — half the weight of the UXELY, for the same two threads. No warranty is published.
Amazon reference	B0BP7CRMBZ
EAN	5714403679576

The questions we get

Is "collects hair neatly" a real feature or a translation?

It describes something real, and it is an honest way round. A click-clack bolt has a slotted shank, and when the cap is up the water drains past it — which means hair catches on the slots rather than going down the pipe. Most people regard that as the standing annoyance of click-clack drains: you lift the cap and there is a tangle on the stem. ALI2 presents it as a benefit: "Not easy to clog debris, can collect hair neatly and prevent it from clogging, things will not enter the drain." Both readings are correct. A trap full of hair is a plumber; a stem with hair on it is a tissue. Whether it is a feature depends on whether you would rather clean the thing you can see.

What does "ideal for overflow sinks" mean?

That the shank is slotted, which is the compatibility question that runs through this whole shelf. A sink with an overflow has a channel molded into the ceramic leading from a hole near the rim down to the outlet — and the water from that channel has to get past the drain body and into the drain. A slotted bolt and body let it through; a solid one blocks it, so the overflow cannot work. The Kohler assembly on this shelf is explicitly without overflow, and the Kraus is explicitly with — and names the alternative part number for the other case. On a bolt, "ideal for overflow sinks" is the same statement in fewer words.

ALI2 or the UXELY bolt?

They are the same part at nearly the same price, and the difference is what the pages publish. ALI2: two bolts, $9.99, M8 and M16 x 1.5, closed height 1.10 in (28 mm), brass. UXELY: one bolt, $7.79, M8 and M16 x 1.5, popped up 1.52 in (38.5 mm), closed 1.10 in (28 mm), overall 2.30 in (58.3 mm), brass, gold finish. UXELY publishes all three heights, which is what lets you check it against the broken one before ordering; ALI2 publishes one and gives you a spare. If you can measure your old bolt, buy on the figures. If not, two for ten dollars means one attempt and one retry.

Against the closest bathroom fittings on price

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
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.
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.

Where the models diverge, in bathroom fittings

If price decides: Tong Gu brass pop-up plug cap, at $8.

The price on Amazon.com

This model is listed on Amazon.com, at ≈ $10 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.

Who buys this one, among bathroom fittings

A click-clack drain that no longer springs — two brass mechanisms for ten dollars

Sources

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.

How we assess these bathroom fittings