Street/Strip Carbureted Applications Two Port Adjustable from 4.5 to 9 PSI;Adjustable from 4.5-9 psi for precise fuel pressure adjustments; Constructed of billet aluminum with a black anodized base and clear anodize top for good looks; Used in systems where a return line is not needed; Use with electric or mechanical pumps; One 3/8" NPT inlet and two 3/8" NPT outlets; 1/8" NPT gauge port; Comparable and interchangeable with popular Holley 12-803 regulator; Mounting bracket included;