What the maker puts in writing
- 3” Toilet Canister Flush Valve Kit: features a 3” canister with a 3” outlet
- “Identification: Look inside the back wall of the toilet tank to identify tank model number”
- “Compatible with Kohler Cimarron tank model number K-4634. This is NOT a universal part”
- From the description: “Protect the warranty on Kohler products, always look for the Kohler Genuine Parts logo. This flush valve was designed by Kohler engineers to maintain original product performance… Use a soft, dampened sponge or cloth. Never use an abrasive material”
The best compatibility statement on this shelf
Two sentences, and together they do something no other listing here manages.
“Look inside the back wall of the toilet tank to identify tank model number.”
“Compatible with Kohler Cimarron tank model number K-4634. This is NOT a universal part.”
One tells you where to look. The other tells you what you need to see — and then says, in capitals, that anything else is the wrong part.
Several of the ten products on this shelf publish some kind of exclusion. This is the only one you can verify in ten seconds with the tank lid off.
Narrow and certain beats broad and hopeful on a parts shelf.
A canister, not a flapper
Worth understanding, because it is the main reason this costs twenty dollars and a flapper costs twelve.
A flapper is a rubber flap hinged on one side, lifted by a chain, dropping back over a round hole. It seals hardest nearest the hinge and least at the far edge, and it has a chain that can rust or get trapped underneath.
A canister is a cylinder that lifts straight up off a circular seat and drops straight back. The seal is a full ring, compressed evenly. There is no chain.
Two consequences follow. It tends to keep sealing as it ages. And it opens the whole 3 inch outlet at once, which is how a 1.28 gallon toilet flushes properly — a generic valve that opens more slowly turns a high-efficiency toilet into one you flush twice.
Which is the real argument for a genuine part
A Cimarron is a 1.28 gallon toilet. Its flush works because the tank empties fast through a wide outlet.
Designed by Kohler engineers to maintain original product performance is, in that light, not marketing. A substitute that behaves differently does not merely leak less — it changes how well the toilet works.
The second claim, that genuine parts protect the warranty on Kohler products, is a matter for the warranty document rather than this page.
What is not on the page
No seal material, and no chlorine or chloramine resistance claim. That is the omission that matters most, because the seal is what fails: four of the ten listings on this shelf name a seal material and its chemical resistance, and this is a three-bullet page that names none.
No warranty on the part itself, where Fluidmaster publishes ten years on a flapper and five on two other products for less money.
And the kit contents are not itemized — it is called a “canister valve replacement/repair kit” and the components are not listed. Sloan, on this shelf, names every piece in its rebuild kit down to the O-ring.
One practical note from the description
Never use an abrasive material such as a brush or scouring pad.
On a sealing surface, that is correct and worth obeying. A scoured seat does not seal, and then you buy this part again.
Availability
Available at around $20.55 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.
