/ WASHER ; 1.8GPM WATER FLOW, REGULATOR y, SHOWER \ HAND 2.5GPM WATER FLOW SN REGULATOR pos As mandated by U.S. federal law ,this shower hand Is equipped with water flow regulator that limits maximum water flow to 1.8 GPM (6.8 liters) per minus at 60 ps| water pressure . In areas with extremely low water pressure causing the shower water flow to be unsatisfactory, the flow regulator may be removed to Improve the water flow in the shower head.