Engineered for performance, Zurn''''s AquaVantage® Exposed Manual Diaphragm Flush Valves provide consistent and reliable water closet operation. They feature a streamlined design while providing high-level performance, unsurpassed water conservation, and long-lasting savings. Each flush valve contains a quiet chemical and clog-resistant GO BLUE® triple-filter diaphragm, reducing maintenance expenses and extending their lifespan. The Z6000AV is available with flush rates ranging from a boosted 4.5 gpf full flush to a maximum water-conserving 1.1 gpf. It even offers a dual-flush option. AquaVantage flush valves include a vandal-resistant control stop cover, a high-pressure vacuum breaker, a cast wall flange with set screw, and an ADA-compliant no-leak handle. Their advanced features make this line a leading solution for any commercial retrofit or new construction project. 1.6 gpf closet flush volume meets U.S. federal standard for water conservation. 24'''' rough-in vs. standard 11-1/2'''' centerline of supply to top of fixture. Dual flush function with a water-conserving 1.6 gpf and a high efficiency 1.1 gpf.