Gerber Plumbing offers 4 4-inch flush valve toilets models in the lineup we track. This page is the Gerber Plumbing-specific cut of the broader 4-inch Flush Valve Toilets (Champion 4 et al.) toilets category — same product class, narrowed to the Gerber Plumbing catalog only.
Gerber Plumbing Fixtures (Lincolnshire, Illinois — a subsidiary of Globe Union Industrial since 2007) has supplied US tract-builder bathrooms since 1932. Lines include Maxwell, Viper, Avalanche, Allerton, and Wicker Park. Gerber's niche is the entry-to-mid commercial spec range: 1.28 GPF or 1.6 GPF gravity toilets, ADA chair-height available throughout, and a parts supply chain that plumbers actually keep in their truck for flush-valve and fill-valve rebuilds.
For the complete Gerber Plumbing lineup across all sub-types and capacities, see the Gerber Plumbing Toilets hub.
If you're cross-shopping 4-inch flush valve toilets beyond Gerber Plumbing, the following brands also ship in this category:
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:
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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