Home-comfort VacuFlush ® Toilets 500 Plus Series Toilet Requirements Water Supply: Line/Fitting – .5-in. (13 mm) ID/.5-in. MPT. Flow – 2 gpm (7.6 lpm) at toilet. Discharge: 1.5-in. (38 mm) ID PVC pipe or sanitation hose connected to VacuFlush vacuum generator or holding tank system. Elongated HushFlush seat and deep, household-size ceramic bowl offer premium user comfort. Anti-splash rim keeps water in. • 1 pint (.4 l) per flush • Foot-pedal operation • Standard and low-profile heights • Above-, below-floor discharge options • White, bone, platinum, ebony colours.