Drill Bit Size Flow Rate 1/2 1.73828E -4 3/8 9.43621E -5 5/16 6.98425E -5 17/64 4.839619 E-5 1/4 4.15077 E -5 15/64 3.7203 E -5 7/32 3.16930 E -5 13/64 2.79476 E -5 3/16 2.4216 E -5 11/64 2.03748 E -5