Kohler 4-inch Flush Valve Toilets (Champion 4 et al.)

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

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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

• Kohler Wellworth Compact Two-Piece Compact-Elongated 1.28 GPF Toilet (K-3978) — Kohler Wellworth Compact — landlord-rebuild Wellworth in compact-elongated bowl shape. 1.28 GPF, comfort height, value-tier.
• Kohler Wellworth Classic Two-Piece Round 1.28 GPF Toilet (K-3987) — Kohler Wellworth — landlord-rebuild-grade Kohler two-piece. Class Five flush, broadly stocked.

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:

• TOTO 4-inch Flush Valve
• American Standard 4-inch Flush Valve
• Niagara 4-inch Flush Valve
• Eljer 4-inch Flush Valve
• Swiss Madison 4-inch Flush Valve
• Woodbridge 4-inch Flush Valve
• Delta 4-inch Flush Valve
• DeerValley 4-inch Flush Valve

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.

Other Kohler filters

Explore Kohler from other angles:

• Kohler Portable Toilets
• Kohler Bidet Toilets
• Kohler Comfort Height
• Kohler Composting Toilets
• All Kohler Toilets