Nitrous Ntimidator LED Nitrous Purge Kit NOS16033Nitrous Ntimidator LED Nitrous Purge Kit 4AN Line, Blue LED NOS16033 S16033 The primary purpose of a purge valve is to release trapped air or gaseous nitrous from feed lines. Helps to ensure consistent performances and it looks cool, too. Includes all required components. Features: Unique Kit Uses Bright Blue LED Illuminates a 4 ft. Plume of Nitrous Strikes Fear into Nighttime Competitors Install Easily w Common Hand Tools Fits All Nitrous Kits w 4 AN