Pressure Regulator - Cast body with powder coated black top. Features 30cc diaphragm and mounting bracket with hardware. 3/8" NPT ports (single inlet, dual outlet). •Supports 4-barrel gas engines up to 600 HP •Designed to operate within 4.5 - 9 PSI range; Preset at 7 PSI •.250" (1/4") restriction •Includes mounting bracket •Includes an 1/8" NPT port for manifold reference Boost Reference 1-1