The 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.