Important InformationMAXIMUM Flow Rates by SizeSize of Service gpm/cfs allowed 2-inch 100 gpm / 0.22 cfs 3-inch 225 gpm / 0.50 cfs 4-inch 400 gpm / 0.88 cfs 6-inch 900 gpm / 2.0 cfs 8-inch 1500 gpm / 3.33 cfs 10-inch 1800 gpm / 4.0 cfs