AEM High Capacity Universal Black Adjustable Fuel Pressure RegulatorA single large return orifice is designed to handle high rate flow pumps. The regulator has a 1: 1 rising pressure rate for boosted applications, and it is alcohol fuel and race fuel compatible. The High Cap Universal FPR is tapped to accept a 9 16" 18 O Ring sealed fittings for inlet and return, and includes a 1 8 NPT port for a fuel pressure gauge or pressure sensor pick up. Inlet: 2 x 6AN (9 16 18) Outlet: 6AN Gauge Port: 1 8 in. NPT Black