Earl's fuel pressure regulator, Black Finish, 1-4 PSI. For Weber, Mikuni, O.E.R , SK & Delorto Carbs.;3/8" NPT ports; Includes Mounting Bracket & Hardware; Low Pressure (1-4 psi); Black Finish; Not Alcohol Compatible; Ideal for Use w/ Weber, Mikuni, SK, OER & Delorto Carbs that Require Lower PSI Rating of 1-4 PSI.; Optional port w/ 10-32 Thread for manifold Boost Reference 1:1;