Earl's fuel pressure regulator, Black Finish, 1-4 PSI. For Weber, Mikuni, O.E.R , SK & Delorto Carbs.. Earl's fuel pressure regulators are designed to adjust for fuel pressure requirements of various carburetors.. Note: This regulator has a vent on the side that can be used as an optional boost reference (don't plug this hole since it is a vent when not using the boost reference feature). The thread size on this port is 10-32.
