The Edelbrock 1728 fuel pressure regulator is machined from aircraft quality aluminum for those who demand the best. Edelbrock EFI fuel pressure regulators have an internal diaphragm made of fluorosilicone to ensure high temperature protection resulting in an extended life. They are compatible with all grades of gasoline, ethanol, methanol and E85 fuels. These regulators will hold fuel system pressure for at least 20 minutes after pump shutdown. Mounting bracket and hardware are included. Each regulator features a vacuum/boost compensating port for a supercharger, turbo or intake manifold vacuum connection. Regulator part #1728 has a black and clear finish with -6 inlet, outlet and return ports.