The NX Purge System is designed to purge the air from your nitrous lines to allow immediate and consistent activation of your Nitrous system. This system includes a Lightning solenoid, push button for activation, and a vent tube to direct the purged nitrous out of the solenoid. This purge system also includes the needed hardware to accommodate plate systems with integrated solenoids. This is the correct purge system for the following part numbers:20110-XX (GM MAF system) 20931-XX (5th Gen Camaro plate system) 20947-XX (Ford 3v plate system) 20948-XX (Ford Coyote plate system)