For most public restrooms, pick the Kohler Highcliff Ultra K-96057: Kohler lists 1.0 to 1.6 gpf by valve, ADA among its codes and a 2,500-pound static load. Pick the Wellcomme Ultra K-96053-B for a standard-height, 4-bolt bowl where accessible height is not required. Check the building’s supply pressure and flow against Kohler’s listed minimums first.
Plumbing Picks is reader-supported. As an Amazon Associate, we earn from qualifying purchases at no extra cost to you.
This guide compares three Kohler commercial flushometer toilet bowls and what the building must supply to run them.
Commercial flushometer bowls compared (Kohler spec sheets)
On a phone, swipe or scroll the table sideways to see every column.
| Bowl | Flush volume (by valve) | Listed accessibility codes | Notes |
|---|---|---|---|
| Highcliff Ultra K-96057 | 1.0, 1.1, 1.28 or 1.6 gpf | ADA, ICC/ANSI A117.1, CSA B651, OBC | Static load 2,500 lb |
| Highcliff Ultra K-96057-SS | 1.0, 1.1, 1.28 or 1.6 gpf | ADA, ICC/ANSI A117.1, CSA B651, OBC | Antimicrobial finish; seat sold separately |
| Wellcomme Ultra K-96053-B | 1.0, 1.1, 1.28 or 1.6 gpf | None listed | Standard height; 4-bolt base |
A commercial toilet in this sense is a tankless bowl fed by a flushometer valve on the wall, the kind used in offices, schools and other public restrooms. The bowl and valve are bought separately, and the valve sets the flush volume. All three Kohler bowls here list a 1-1/2-inch top spud, a 2-1/8-inch fully glazed trapway, a 10 × 7-inch water surface, 5-1/2-inch seat-mounting holes and a 10- or 12-inch rough-in.
Kohler Highcliff Ultra K-96057: the ADA-listed bowl
Choose the Kohler Highcliff Ultra for most public restrooms, where accessibility rules often apply. The K-96057 spec sheet (resources.kohler.com) lists an elongated vitreous china bowl rated at 1.0, 1.1, 1.28 or 1.6 gallons per flush depending on the flushometer, a static load rating of 2,500 pounds, and ADA, ICC/ANSI A117.1, CSA B651 and OBC among its codes, along with WaterSense and the California Energy Commission.
Kohler notes it replaces the older Highcrest K-4302, Highcliff K-4368 and Highline K-4405, with the caution that height and footprint may vary, so check the drawing against the existing floor and wall before swapping.
On October 15, 2026, the standard new offer sold by Amazon.com showed limited stock with model 96057-0 (MPN K-96057-0), White.
Check Kohler Highcliff Ultra K-96057-0 flushometer bowl on Amazon →
Kohler Highcliff Ultra K-96057-SS: antimicrobial finish
Choose the K-96057-SS if you want the same Highcliff Ultra bowl with Kohler’s antimicrobial finish. The K-96057-SS spec sheet (resources.kohler.com) lists the same flush volumes, trapway, rough-in, static load and codes as the standard Highcliff Ultra, and notes that the seat is sold separately.
Read Kohler’s own limit on that finish: it says the finish inhibits the growth of mold-, mildew-, stain- and odor-causing bacteria on the fixture surface, that it does not protect users against bacteria, viruses or other disease organisms, and that the product should still be cleaned thoroughly. Treat it as a surface-finish option, not a health feature.
On October 15, 2026, the standard new offer sold by Amazon.com showed limited stock with model K-96057-SS-0, White.
Check Kohler Highcliff Ultra K-96057-SS-0 antimicrobial bowl on Amazon →
Kohler Wellcomme Ultra K-96053-B: standard height, 4-bolt base
Choose the Kohler Wellcomme Ultra K-96053-B where a standard-height bowl is wanted and you prefer a four-bolt floor attachment. The K-96053-B spec sheet (resources.kohler.com) lists an elongated, standard-height bowl with a 4-bolt base for added stability, the same 1.0 to 1.6 gpf range by flushometer, and replacement of the older Wellcomme K-4350-B.
Its sheet lists WaterSense and the California Energy Commission but no ADA code, so it is not the bowl to specify where an accessible-height fixture is required. It also notes that if fixture supply pressure is below 35 psi static, the bowl must be paired with a valve rated at 1.28 gpf or greater.
On October 15, 2026, the standard new offer from Standard Plumbing Supply showed limited stock with model K-96053-B-0, White.
Check Kohler Wellcomme Ultra K-96053-B-0 4-bolt flushometer bowl on Amazon →
Supply pressure and flow: the part people miss
Flushometer bowls need more water, faster, than a tank toilet. Kohler’s sheets for all three list a minimum static pressure of 35 psi, a maximum of 80 psi, a minimum flowing pressure of 25 psi and a minimum flow rate of 25 gallons per minute at the fixture.
Before choosing a flushometer bowl for a house or small shop, measure static pressure with a gauge and confirm with your plumber that the supply line can deliver the listed flow; our water pressure gauge guide covers gauges. Kohler’s Wellcomme sheet also says that below 35 psi static the bowl must be paired with a valve rated at 1.28 gpf or more. If static pressure runs above 80 psi, our pressure regulator guide covers the fix.
Matching the flushometer valve
The bowl does not decide the flush volume; the valve does. Pick a flushometer rated for the volume you want within the bowl’s listed range, and make sure your local code allows it. For an existing installation, check the rating on the current valve before you order a new bowl.
For worn valves, our Zurn flush valve repair kit guide covers rebuild kits. If you are fitting out a full restroom, our Kohler urinal guide and American Standard urinal guide cover the matching urinals.
Rough-in, seats and drainage
All three sheets list a 12-inch rough-in in their technical information and a 10- or 12-inch option in their features; confirm the measurement from the finished wall to the flange center before ordering. Our toilet rough-in guide shows how to measure.
The seats are sold separately. Kohler’s sheets note that plumbing codes may require elongated toilets and elongated, open-front seats in public bathrooms. For back-to-back installations, the sheets say to use only a 45-degree double wye fitting, so check the existing drain fitting if two bowls share a wall.
Replacing an older commercial bowl
Kohler lists the Highcliff Ultra as the replacement for the Highcrest K-4302, Highcliff K-4368 and Highline K-4405, and the Wellcomme Ultra K-96053-B as the replacement for the Wellcomme K-4350-B. In each case the sheet warns that height and footprint may vary. Before demolition, compare the new drawing with the old bowl’s rough-in, the flushometer’s outlet height above the bowl spud, and any floor finish the old bowl covered, so the new bowl and valve line up without surprises.
For a home bathroom with a tank toilet, see our chair-height toilet guide instead.
Frequently asked questions
What is a commercial toilet?
A tankless bowl fed by a flushometer valve on the wall, common in public restrooms. The bowl and valve are bought separately.
Do commercial toilets come with the flush valve?
No. Kohler lists these bowls at 1.0 to 1.6 gpf depending on the flushometer specified, sold separately.
What water pressure does a flushometer toilet need?
Kohler lists 35 psi minimum static, 80 psi maximum static, 25 psi minimum flowing and 25 gpm minimum flow for these bowls.
Which Kohler commercial bowl is ADA listed?
The Highcliff Ultra K-96057 and K-96057-SS list ADA among their codes; the Wellcomme Ultra K-96053-B does not.
Can I put a flushometer toilet in a house?
Only if the supply can meet the maker’s pressure and flow figures; otherwise choose a tank toilet.
How we chose
This document-based guide makes no hands-on testing claim. We read Kohler’s spec sheets for the Highcliff Ultra K-96057 and K-96057-SS and the Wellcomme Ultra K-96053-B. On October 15, 2026, the two Highcliff offers sold by Amazon.com and the Wellcomme offer from Standard Plumbing Supply showed limited stock. We do not repeat Kohler’s comparative performance marketing. Read our selection method and about Plumbing Picks.
Primary sources
- Kohler Highcliff Ultra K-96057 spec sheet (resources.kohler.com): 1.0-1.6 gpf by valve, 1-1/2 in. top spud, trapway, water surface, 2,500 lb, codes, replaces, supply requirements, double wye note.
- Kohler Highcliff Ultra K-96057-SS spec sheet (resources.kohler.com): antimicrobial finish and its stated limits, seat sold separately.
- Kohler Wellcomme Ultra K-96053-B spec sheet (resources.kohler.com): standard height, 4-bolt, codes, 35 psi / 1.28 gpf note.