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Nitrous Express Nitrous Purge Valve (4AN Manifold Push Button and Vent Tube) Air Filters>HVAC Filters 67in - Alum - (2)The NX Purge System is designed to purge the air from your nitrous lines to allow immediate 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. The Purge system can also be used to lower the bottle pressure for spot on nitrous performance every time you activate the system.