Edelbrock Adjustable Billet Carbureted Fuel Pressure RegulatorThe Edelbrock Fuel Pressure Regulator #8190 is for carburetor applications that require consistent pressure from 4 1 2 to 9 psi. It features two 3 8" NPT outlets, one 3 8" NPT inlet, 1 8" NPT gauge port and is adjustable from 5 to 12 psi. This regulator is manufactured from billet aluminum and features a Nylon reinforced Nitrile diaphragm for excellent heat and leak resistance.