Spectre's Fuel Pressure Regulator was designed to keep the pressure in the fuel lines of your vehicle consistent. This universal pressure regulator is for use on carbureted engines with less than 15 PSI of fuel pressure. Not for use on any fuel injected engines. With an adjustable pressure range of 1 PSI to 4 PSI, it includes barb fittings for 3/8-inch fuel line applications. Designed to perform as good as they look, the Spectre fuel pressure regulator includes a chrome plated finish. Spectre s Fuel Pressure Regulator was designed to keep the pressure in the fuel lines of your vehicle consistent. This universal pressure regulator is for use on carbureted engines with less than 15 PSI of fuel pressure.