The 503UH Series pressure-assist system uses only 0.75 gallons per flush (gpf). The new ultra-high efficiency system, which is compatible with Flushmate’s I-Flush technology, uses 53 percent less water than 1.6 gpf models without compromising performance.
SC Johnson Professional: Alcare Extra with OPTIDOSE
Horton Automatics: BH Slider
Kimball International: Shore
Protimeter: Aquant
Sensaphone: Sentinel PRO