Item regulates liquid flow from 5.51 to 6.09 gpm through internal orifice and stepped diameter passage; entrance 0.3583 to 0.3593 in. Dia, exit 0.706 to 0.712 in dia hexagon tightening surfaces 1.38 in. Across; external threads 0.562 in. Diameter at entrance end, 1.062 in. Dia. At exit end; internal threads on exit end 0.750 in. Dia, 0.50 in. Lg.