Honda/Acura DOHC Engine Adjustable Fuel Pressure Regulator (Black) - B16 B18 B20 F20 F22 H23 Reviewhttp://tinyurl.com/orox6ar Honda/Acura DOHC Engine Adjustable Fuel Pressure Regulator (Black) - B16 B18 B20 F20 F22 H23 CNC machined light weightAdjustable fuel pressure regulator with 1:1 ratioDeliver high performance, with long life and high reliable operationAdjustable from a range of 30 PSI to the maximun fuel pump capacityThread size: 9/16 - 9/18