Zurn offers 4 4-inch flush valve toilets models in the lineup we track. This page is the Zurn-specific cut of the broader 4-inch Flush Valve Toilets (Champion 4 et al.) toilets category — same product class, narrowed to the Zurn catalog only.
Zurn Industries (Milwaukee, Wisconsin, founded 1900) is one of the largest US commercial plumbing brands — the dominant supplier of commercial flush valves (the metal valves on commercial diaphragm-flush toilets), wall-hung toilet carriers, sensor-flush systems, and floor drains across US offices, hotels, schools, and hospitals. The Zurn toilet line is primarily commercial-spec: wall-hung bowls designed to mount on Zurn-supplied steel carriers, with Zurn diaphragm flush valves controlling the flush. Residential Zurn toilet presence is small (the brand doesn't target Home Depot or Lowes channel...
For the complete Zurn lineup across all sub-types and capacities, see the Zurn Toilets hub.
If you're cross-shopping 4-inch flush valve toilets beyond Zurn, 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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