Kohler offers 26 4-inch flush valve toilets models in the lineup we track. This page is the Kohler-specific cut of the broader 4-inch Flush Valve Toilets (Champion 4 et al.) toilets category — same product class, narrowed to the Kohler catalog only.
About Kohler
<p>Kohler's water filters lineup is one of the most-shopped in the category — and there are concrete reasons it stays that way year after year. This page is the complete index of every Kohler water filters model we currently track, with verified specifications, current Amazon pricing, aggregated ratings, and head-to-head comparison links against the strongest competitors in each price tier. Before you start filtering, the next several minutes will give you the context you need to make a confident pick.</p>
<h2 id="brand-overview">About Kohler in water filters</h2>
<p>On warranty length, buil...
For the complete Kohler lineup across all sub-types and capacities, see the Kohler Toilets hub.
Kohler 4-inch Flush Valve Toilets (Champion 4 et al.) models we track
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Kohler Cimarron Comfort Height Elongated Toilet (K-3589-0) — Kohler Toilets — verified specs and current Amazon pricing.
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Kohler Highline Pressure-Lite Two-Piece Elongated 1.0 GPF Toilet (K-3854) — Kohler Highline Pressure-Lite — pressure-assist Highline with Flushmate internals. 1.0 GPF + commercial-grade flush velocity in a residential SKU.
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Kohler Numi 2.0 Intelligent Toilet with Alexa, Bluetooth Speakers (K-4026-0) — Kohler Numi 2.0 — the broadest-feature US luxury smart toilet. Alexa, Bluetooth speakers, mood lighting, foot-warmer, every smart feature.
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Kohler Maxton One-Piece Elongated Skirted Trapway Toilet (K-31621) — Kohler Maxton — modern one-piece with skirted trapway and AquaPiston canister flush.
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Kohler Memoirs Stately One-Piece Elongated 1.28 GPF Toilet (K-3933) — Kohler Memoirs Stately — classic-styled designer one-piece with AquaPiston flush.
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Kohler Karing Intelligent Toilet with Integrated Bidet (K-77780-CD-0) — Kohler Karing — Kohler's first-generation intelligent toilet. Integrated bidet, heated seat, dual-flush, the original Kohler smart toilet before Numi/Veil.
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Kohler Veil Wall-Hung Elongated 1.28 GPF Toilet Bowl (K-6299) — Kohler Veil Wall-Hung — designer-spec wall-hung bowl. Pure-Clean glaze, Reach flush, mounts on Geberit Duofix carrier.
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Kohler Memoirs Classic One-Piece Elongated 1.28 GPF Toilet (K-3819) — Kohler Memoirs Classic — variant of Memoirs Stately with classical-modern aesthetic. AquaPiston canister, one-piece, full elongated.
Other 4-inch Flush Valve toilets brands
If you're cross-shopping 4-inch flush valve toilets beyond Kohler, the following brands also ship in this category:
About 4-inch Flush Valve Toilets (Champion 4 et al.) toilets
A 4-inch flush valve is the largest flush valve sold in US residential toilets. The standard residential flush valve is 2-inch or 3-inch; 4-inch is the rare premium specification, found primarily on the American Standard Champion 4 line. The larger valve moves water from the tank to the bowl at much higher velocity than a 2"-3" valve, which means stronger flush performance at the same GPF.
Flush velocity = (tank water volume × valve diameter) / time. A bigger valve = more velocity per gallon of water. For a 1.28 GPF toilet:
- 2-inch flush valve: flow rate ~30 seconds per gallon
- 3-inch flush valve: flow rate ~15 seconds per gallon
- 4-inch flush valve: flow rate ~7 seconds per gallon
The 4-inch valve dumps the entire 1....
For the complete 4-inch flush valve buyer's guide (all brands, full comparison framework), see the 4-inch Flush Valve Toilets (Champion 4 et al.) category hub.
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