Carbureted By Pass Style Fuel Pressure Regulator, For Use With Gasoline, Port Sizes: (1) 3/8" NPT Inlet/(1) 3/8" NPT Outlet/(1) 3/8" NPT Return, Gauge Port: 1/8" NPT, Cast Aluminum, Mounting Bracket Included, Black E-Coat Finish|Holley 12-887 Carbureted Fuel Pressure Regulator.