Check the listing for details. 15600 Nitrous Express -4AN Nitrous Purge Valve System. Color: Black, Condition: New. Listed at 192.86 USD. 15600 Nitrous Express -4AN Nitrous Purge Valve System Description: 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. Also included is a -4 AN manifold to run inline with your nitrous feedline. This allows you to purge the nitrous system, even when you do not have a purge port built into your solenoids. The Purge system can also be used to lower the bottle pressure for spot on nitrous performance every time you activate the system. Purge System includes: Purge Solenoid-4AN Adapter FittingPush button activation1/8 to 1/8 NPT Fitting1/8 NPT to Compression Fitting7 inches of 3/16" Stainless Tubing.If you run a larger -6 AN feedline, the correct purge system is PN# 15601. If you run Lightning or Iceman solenoids, the correct purge system is PN# 15603. Shipping is FREE inside the contiguous United States. If shipping to Alaska, Hawaii or Puerto Rico please message us for a quote for additional shipping costs.