Sloan Valve Co. 0.5-gpf urinal Flushometers use just enough water to effectively and hygienically wash down vitreous china fixtures for substantial water savings. Sloan’s exposed, manual urinal models with 0.5-gpf flush cycles include: Royal® (shown), Royal II®, Regal® and Sloan® Flushometers, which are diaphragm-type; and Crown®, Crown® II and Gem·2® models, which are piston-type Flushometers. The Flushometers comply with applicable ANSI/ASME 112.19.6 standards.