Delta offers 7 4-inch flush valve toilets models in the lineup we track. This page is the Delta-specific cut of the broader 4-inch Flush Valve Toilets (Champion 4 et al.) toilets category — same product class, narrowed to the Delta catalog only.

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For the complete Delta lineup across all sub-types and capacities, see the Delta Toilets hub.

Delta 4-inch Flush Valve Toilets (Champion 4 et al.) models we track

Delta Foundations Two-Piece Elongated 1.28 GPF Toilet (C43913) — Two-piece elongated toilet with 1.28 GPF FluidMaster flush, ADA comfort height, and traditional profile. Delta's entry-level value-tier two-piece.
Delta Riosa One-Piece Compact 1.28 GPF Toilet (C43901) — Compact one-piece toilet with 1.28 GPF dual-flush, modern skirted design, and ADA comfort height. Delta's value-tier one-piece for space-constrained bathrooms.
Delta Hatcher Two-Piece Elongated 1.28 GPF Comfort Height Toilet (C43101) — Delta Hatcher — modern WaterSense Comfort Height residential toilet. Brand-extension from Delta's dominant faucet line at Home Depot/Lowes Pro Desk.
Delta Conway Two-Piece Elongated 1.28 GPF Comfort Height Toilet (C43909) — Delta Conway — value-tier Delta WaterSense Comfort Height. Sub-$280 entry into Delta toilet brand-extension family for budget Delta-faucet remodels.
Delta Avi One-Piece Elongated 1.28 GPF Designer Toilet (C53901) — Delta Avi — Delta's designer one-piece skirted toilet. Modern aesthetic at sub-$520 for premium Delta-faucet bathroom remodels.
Delta Verano Two-Piece Round-Front 1.28 GPF Comfort Height Toilet (C43203) — Delta Verano — round-front Delta WaterSense for powder rooms and half-baths. Brand-extension Delta toilet for tight bathroom Delta-faucet remodels.
Delta Prelude Two-Piece Elongated 1.6 GPF Standard Height Toilet (C43011) — Delta Prelude — 1.6 GPF Delta toilet for pre-1980 housing replacement. Brand-extension Delta drainline-rescue option at sub-$260.

Other 4-inch Flush Valve toilets brands

If you're cross-shopping 4-inch flush valve toilets beyond Delta, 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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