For a one-piece toilet with a seat, pick the Kohler Cimarron K-3619. For a skirted two-piece that installs without drilling the floor, pick the K-5310. For a small bathroom, pick the round-front K-31641, or the K-31644 if you want automatic bowl cleaning. All four are 1.28 gpf Comfort Height.
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This guide compares four Kohler Cimarron toilets using Kohler’s own spec sheets.
Kohler Cimarron toilets compared (Kohler spec sheets)
On a phone, swipe or scroll the table sideways to see every column.
| Toilet | Build / bowl | Water surface | Seat |
|---|---|---|---|
| K-3619 | One-piece, elongated, concealed trapway | 12-1/2 × 10-1/2 in. | Quiet-Close seat included |
| K-5310 | Two-piece, elongated, skirted trapway | 9-5/8 × 6-5/8 in. | Sold separately |
| K-31641 | Two-piece, round front | 8-5/8 × 7-13/16 in. | Sold separately |
| K-31644 | Two-piece, round front, ContinuousClean | 8-5/8 × 7-13/16 in. | Sold separately |
Cimarron is a Kohler toilet line sold in many versions. All four here use Kohler’s AquaPiston canister flush valve instead of a flapper and Comfort Height, Kohler’s chair-height bowl. The differences are one-piece or two-piece, elongated or round, an exposed or covered trapway, and whether the tank adds an automatic cleaner.
Kohler Cimarron K-3619: one-piece with a seat
Choose the Cimarron K-3619 for a one-piece elongated toilet with a covered trapway and the seat included. Kohler’s spec sheet (resources.kohler.com) lists a one-piece design with the tank and bowl integrated, an elongated Comfort Height bowl, a concealed trapway and Clean Caps low-profile bolt caps, a left-hand polished chrome trip lever, an included Reveal Quiet-Close elongated seat, the AquaPiston canister, 1.28 gpf, a 2-1/8-inch fully glazed trapway and a 12-inch rough-in. Kohler says the canister needs less force to flush than a 3-inch flapper and has 90% less exposed seal material.
The technical table lists a 12-1/2 × 10-1/2-inch water surface, the largest here, and 5-1/2 inches from rim to water. The supply line is sold separately.
On October 15, 2026, the standard new offer sold by eFaucets showed limited stock with model K-3619-0, white.
Check Kohler Cimarron K-3619-0 one-piece toilet on Amazon →
Kohler Cimarron K-5310: skirted, no floor drilling
Choose the Cimarron K-5310 for a two-piece elongated toilet with a smooth skirted side. Kohler’s spec sheet (resources.kohler.com) lists a skirted trapway that simplifies cleaning, a Comfort Height elongated bowl, a left-hand chrome lever, the AquaPiston canister, 1.28 gpf and Kohler’s ReadyLock installation system, which Kohler says eliminates the need to drill into the floor on a standard 12-inch rough-in. It combines the K-5309 bowl and K-4369 tank.
Kohler sells K-5383 and K-5381 kits for 10-inch and 14-inch rough-ins, and lists a 15 psi minimum static pressure. The seat and supply are sold separately; Kohler lists its K-4108 PureWash bidet seat and K-7637 angle stop among the recommended accessories.
On October 15, 2026, the standard new offer sold by Amazon.com showed In Stock with model 5310-0, white.
Check Kohler Cimarron K-5310-0 skirted toilet on Amazon →
Kohler Cimarron K-31641: round front for small bathrooms
Choose the Cimarron K-31641 for a round-front bowl in a powder room or small bathroom. Kohler’s spec sheet (resources.kohler.com) lists a two-piece round-front Comfort Height toilet, 1.28 gpf, a 2-1/8-inch trapway, Revolution 360 flushing that Kohler says generates a swirling motion to keep the bowl clean longer, a sanitary guard where the bowl and tank meet, a CleanCoat surface that Kohler says inhibits water scale and mineral stains, and the AquaPiston canister. It combines the K-31589 bowl and K-31615 tank.
The water surface is 8-5/8 × 7-13/16 inches, and the seat and supply line are sold separately; Kohler suggests its K-76923 round seat.
On October 15, 2026, the standard new offer sold by Amazon.com showed In Stock with model 31641-0, white.
Check Kohler Cimarron K-31641-0 round toilet on Amazon →
Kohler Cimarron K-31644: ContinuousClean
Choose the Cimarron K-31644 if you want the tank to add bowl cleaner with every flush. Kohler’s spec sheet (resources.kohler.com) lists the same round-front Comfort Height bowl, 1.28 gpf, Revolution 360 flushing, CleanCoat and AquaPiston canister as the K-31641, plus a ContinuousClean system that dispenses cleaning solution with every flush, works with any white toilet bowl cleaner tablet, and has an adjustment dial for how much is dispensed. Kohler’s K-31644 spec sheet says this ContinuousClean ST system holds one tablet for up to six months of cleaning. (The one-year figure is for Kohler’s separate ContinuousClean XT system.)
Kohler also claims the combination keeps the bowl cleaner five times longer than conventional Kohler toilets, based on a 2019 consumer perception study and bacterial counts; that is Kohler’s claim, not our test.
On October 15, 2026, the standard new offer sold by Amazon.com showed an add-to-cart button with model 31644-0; the page did not show a separate stock line.
Check Kohler Cimarron K-31644-0 ContinuousClean toilet on Amazon →
AquaPiston: why no flapper
All four use Kohler’s AquaPiston canister in place of a flapper. Kohler describes it as a canister that optimizes the flow out of the tank, needs less force to flush than a 3-inch flapper and has 90% less exposed seal material, which it says resists the wear, shrinkage and swelling that affect flapper seals. When the seal does need replacing, buy the canister seal Kohler lists for your model rather than a generic flapper; our Kohler canister seal guide covers that repair.
Skirted, concealed or exposed trapway
The trapway is the curved channel at the base of the bowl. On the round K-31641 and K-31644 it is exposed, so you see its curves from the side. The one-piece K-3619 has a concealed trapway with low-profile Clean Caps over the bolts, and the K-5310 has a skirted trapway, a smooth side that Kohler says simplifies cleaning. Skirted toilets need a different mounting; Kohler’s ReadyLock system on the K-5310 avoids drilling into the floor at a 12-inch rough-in. Our skirted toilet guide compares skirted models from other brands.
Which Cimarron should you buy?
For a one-piece with a concealed trapway and a seat in the box, choose the K-3619. For a skirted two-piece, choose the K-5310, especially if your rough-in is 10 or 14 inches and you need Kohler’s kit. For a powder room, choose a round front: the K-31641, or the K-31644 if you want cleaner dispensed with each flush and will keep tablets in it.
Before you buy
All four are designed for a standard 12-inch rough-in; only the skirted K-5310 sheet lists 10-inch and 14-inch kits. Measure yours with our rough-in guide. Kohler notes that plumbing codes may require elongated toilets and elongated, open-front seats in public bathrooms, so check code before using the round models outside a home. Our round vs elongated guide and one-piece vs two-piece guide cover those choices, and our Kohler toilet guide covers the Cimarron K-31621 and other Kohler lines.
Frequently asked questions
What flush does the Kohler Cimarron use?
The four here use Kohler’s AquaPiston canister and 1.28 gallons per flush.
Is the Cimarron chair height?
Yes. All four have Kohler’s Comfort Height chair-height bowl.
Which Cimarron includes a seat?
The one-piece K-3619 includes a Reveal Quiet-Close seat; the others do not.
Does the Cimarron fit a 10-inch rough-in?
Kohler lists 10-inch and 14-inch kits only for the skirted K-5310; the others are 12-inch.
What is ContinuousClean?
A Kohler tank system on the K-31644 that dispenses cleaner from a bowl-cleaner tablet with every flush.
How we chose
This document-based guide makes no hands-on testing claim. We read and rendered Kohler’s spec sheets for the K-3619, K-5310, K-31641 and K-31644. On October 15, 2026, we checked each linked standard new Amazon offer for model, seller, stock and an add-to-cart button. The elongated Cimarron K-31621 is covered in our Kohler toilet guide. Read our selection method and about Plumbing Picks.
Primary sources
- Kohler Cimarron K-3619 spec sheet (resources.kohler.com): one-piece, concealed trapway, seat included, water surface.
- Kohler Cimarron K-5310 spec sheet (resources.kohler.com): skirted, ReadyLock, rough-in kits, 15 psi.
- Kohler Cimarron K-31641 spec sheet (resources.kohler.com): round, Revolution 360, CleanCoat, components.
- Kohler Cimarron K-31644 spec sheet (resources.kohler.com): ContinuousClean, tablets, 5x claim basis.