Wash fountain 3/4 4 Water closet, gravity flush tank 1/2 2.5 2.5 Water closet, flushometer valve 1 2.5 2.5 Water cooler 1/2 0.5 0.5 1 WSFU = 1 GPM = 3.79 liter/min 1 in = 25.4 mm Note that this conversion is only true for one or a few fixtures. Since all fixtures in a ...