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Quick answer from a licensed plumber: Match the fill valve to the model, not the brand. Kohler’s two adjustable kits are the GP1083167 (Class Five toilets such as Cimarron, Wellworth, Highline, Memoirs, Archer, Devonshire) and the GP1138930 (Cimarron, Persuade, Tresham, Wellworth, Reach, Windham, Veil, Garwind, Maxton); where a collection is on both lists, Kohler’s Amazon listings (not its part pages) say a black shank means GP1083167 and a gray shank means GP1138930. Low-profile one-piece Rialto, San Raphael and Revival toilets take the GP1068030, and Cabernet, Rochelle, Archer and Pillow Talk one-piece toilets take the 84499 conversion kit.
Top pick for most Kohler two-piece toilets: Kohler GP1083167 Silent Fill Valve Kit for Class Five toilets (Amazon-sold on September 24, 2026). Gray shank? Use the GP1138930 instead.
Step 1: Find the Toilet Model Number
Kohler sells more than one fill valve, and its support site is blunt about why the model matters: “The part number of the fill valve will vary based on the toilet model number.” Kohler model numbers “contain a base number, followed by a dash, and series of letters and numbers,” with a “K” in front of the base number that “may not be included on certain product labels and when stamped onto the product itself.” The letters after the dash are a series or variation (Kohler’s example: “RA” means right-hand trip lever) and the color code follows (“0” is white).
Kohler says the number may be on the product label on the box, in the homeowners guide, on the receipt, or “Stamped directly onto the product itself.” With the model number, Kohler’s parts diagrams do the rest: enter it in the search box on kohler.com, open the product page, scroll to Parts & Support and click Parts under Interactive Parts Diagram. If you cannot find a number, Kohler’s Customer Care Center can identify the product from the serial label.
Step 2: Match the Fill Valve to the Collection
These are the fill valves Kohler sells as service parts, with the collections Kohler lists on each part page. (TOTO keys its fill valves to the tank model instead; see our TOTO fill valve guide.) Kohler says the first kit “fits most two-piece toilets” and lists the second by collection; low-profile one-piece Rialto, San Raphael and Revival toilets get the third; four one-piece collections get a conversion kit that replaces the fill valve and flush valve together.
| Kohler part | Kohler lists it for | What it is |
|---|---|---|
| GP1083167 Silent Fill Valve Kit for Class 5 Toilets | Cimarron, Memoirs, Archer, Wellworth, Highline, Devonshire, Santa Rosa, Gabrielle, Alterna, Tresham, Adair, Iron Works, Reach, Kingston, Irvine, Betello, Gleam and Artifacts | “Adjustable fill valve maintains proper water level and refills tank after each flush”; “Easy-to-install design fits most two-piece toilets”; “Cap color may vary.” Kohler marks the older K-1083167 kit discontinued. |
| GP1138930 Silent Fill Toilet Valve Kit | Cimarron, Persuade, Tresham, Wellworth, Reach, Windham, Veil, Garwind and Maxton | Kohler calls it the “FILL VALVE SERVICE KIT, 400A Series”; “Maintains proper water level for efficient flushing”; “Easy installation with standard tools.” |
| GP1068030 Fill Valve for One-Piece Toilets | Rialto, San Raphael and Revival | “Low-profile fill valve for one-piece toilets”; “Precisely regulates water level and tank refill.” |
| 84499 1B1X Tank Conversion Kit | Cabernet, Rochelle, Archer and Pillow Talk | “Complete conversion kit for one-piece toilets – includes fill valve, flush valve, flapper, and gaskets.” |
Cimarron, Tresham, Wellworth and Reach appear on both two-piece lists. Kohler’s Amazon listings settle it by the color of the fill valve’s shank, the threaded tube that goes through the tank bottom. The GP1083167 listing says: “Look at shank color to determine correct part; if black, use this part and if grey, use GP1138930.” The GP1138930 listing says the same thing the other way around. So on those four collections, pull the old valve, look at the shank, and buy the kit that matches. Kohler’s own video covers both kits together, so the installation is shown once.
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Step 3: Rule Out Debris Before You Buy
Kohler’s troubleshooting page says a toilet that runs constantly “is often caused by sediment or debris lodged in the cap of the fill valve preventing the water from turning off,” and that this “is common during new toilet installation because turning the water supply on and off can loosen sediment within the water lines.” Its first corrective action is “Clean the fill valve or replace the fill valve,” in that order: “Replace the fill valve if the toilet is still constantly running after flushing the fill valve.” Kohler’s flush-out videos for two-piece and low-profile one-piece toilets say all you need “is a plastic cup.”
Two simpler causes get checked at the same time. Kohler says to adjust the trip lever chain so it has “roughly one to two links of slack so the excess chain does not get caught on the trip lever arm,” and that if water spills into the overflow “but eventually stops, the tank water level will need to be adjusted.” A valve that shuts off, just too high, needs a height adjustment, not a new part.
Step 4: Replace It
The GP1083167 and GP1138930 kits are adjustable-height valves that go in the same way. Turn the supply off first and confirm it is off before you loosen anything. If a shutoff valve will not close, or the tank or pipe is cracked, stop and call a licensed plumber. Flush to empty the tank, sponge out the rest, disconnect the supply line at the tank, unscrew the old locknut under the tank, lift the old valve out, set the new valve’s height so its critical level mark sits above the overflow tube per the instructions in the box, tighten the new locknut by hand plus a little, clip the refill tube to the overflow tube, reconnect the supply and turn the water on slowly. Kohler’s video for the two universal kits walks through the same steps.
The 84499 Conversion Kit
If your one-piece toilet is a Cabernet, Rochelle, Archer or Pillow Talk, the service part Kohler lists for it is the 84499 1B1X kit, which “includes fill valve, flush valve, flapper, and gaskets” and is “Designed for sanitary replacement of worn internal components.” Kohler’s video for it shows the fill valve and flush valve being replaced together. On September 24, 2026 the only Kohler-branded 84499 listing on Amazon was sold and shipped by a third-party seller, so it is not linked here; Kohler’s own part page is in the sources.
FAQ
Which Kohler fill valve do I need?
It depends on the model. Kohler lists the GP1083167 for Cimarron, Memoirs, Archer, Wellworth, Highline, Devonshire and other two-piece collections, the GP1138930 for Cimarron, Persuade, Tresham, Wellworth, Reach, Windham, Veil, Garwind and Maxton, the GP1068030 for Rialto, San Raphael and Revival one-piece toilets, and the 84499 conversion kit for Cabernet, Rochelle, Archer and Pillow Talk one-piece toilets.
What is the difference between Kohler GP1083167 and GP1138930?
Both are adjustable Silent Fill kits (Kohler says the GP1083167 “fits most two-piece toilets”), and some collections are on both lists. Kohler’s Amazon listings, not its part pages, say to look at the shank color of the old valve: black means GP1083167, gray means GP1138930.
Where is the model number on a Kohler toilet?
Kohler says model numbers can be found on the box label, in the homeowners guide or installation instructions, on the receipt, or stamped on the product itself. The number starts with a K, then a base number, a dash, and series and color codes; 0 is white.
Why does my Kohler toilet keep running after a new fill valve?
Kohler says constant running is often debris under the fill valve cap, a trip lever chain with so much slack that the excess catches on the arm, or a water level set so high that water spills into the overflow. Flush the valve with a cup of water, set the chain to one or two links of slack, and lower the valve before replacing anything else.
Can I use a universal fill valve in a Kohler toilet?
Kohler’s two-piece kits are themselves adjustable, universal-style valves, and Kohler calls the GP1138930 a 400A Series service kit. Kohler asks owners to use its genuine parts to protect the warranty, so the choice is between a Kohler-branded kit and a generic one of the same type.
Why Trust Plumbing Picks
Plumbing Picks is written by a licensed Georgia journeyman plumber. Every part number, model list, size, setting and fit on this page comes from the manufacturer pages and documents listed below, which we opened and read; product details come from those makers and from the Amazon listings, not from hands-on testing. Each linked product was shipped or sold by Amazon, new and in stock, when we checked on September 24, 2026. Where a link goes to Amazon we may earn a commission at no extra cost to you. Nobody pays to be included here. More on who writes this and how we pick.
Sources
- Kohler: Silent Fill Valve Kit for Kohler Class 5 Toilets (K-GP1083167)
- Kohler: Kit, Adjustable Fill Valve (K-1083167, discontinued)
- Kohler: Silent Fill Toilet Valve Kit (K-GP1138930)
- Kohler: Fill Valve for One-Piece Toilets (K-GP1068030)
- Kohler: 1B1X Tank Conversion Kit (K-84499)
- Kohler Assist: Toilet Constantly Leaking or Running
- Kohler Assist: Finding a KOHLER or STERLING Product Model Number or Serial Number
- Kohler Assist: Identify Product Replacement Parts (interactive parts diagrams)
- Kohler Assist: GP1138930 and GP1083167 Universal Fill Valve Replacement (video)
- Kohler Assist: 84499 Toilet Conversion Kit for One-Piece Toilets (video)
Bottom Line
Find the model number, flush the old valve with a cup of water, and only then buy. Most two-piece Kohler collections take the GP1083167 (black shank) or GP1138930 (gray shank); Rialto, San Raphael and Revival take the GP1068030; Cabernet, Rochelle, Archer and Pillow Talk one-piece toilets take the 84499 kit that also replaces the flush valve.