Zurn’s low-flow EcoVantage 1.1 gal. per flush ZTR Sensor Wall Bowl System requires 31% less water per flush. The low-flow performance is also 20% better than the LEED baseline water savings for commercial buildings. The system includes the wall bowl and the 1.1 gpf top-mount sensor flush valve or the 1.1 gpf top-mount sensor flush valve with long-life battery. It can be used in combination with the reduced splash-back Omni-Flo Urinal — which includes the 0.5 gpf sensor-activated, battery-operated piston flush valve with long-life batteries. Zurn Industries.