16030 NOS 4AN Line Nitrous Purge Valve Kit For Purging Nitrous Oxide System Features: Function: This purge valve kit help release the trapped air or gaseous nitrous from the feed lines. The valve eliminates the lag time caused from vacuum accumulation in the feed line to ensure a consistent performance. Direct Replacement: Manufacturer part number 16030, directly replace for your broken 4AN Line Purge Valves. All required components included for quick & easy installation. Hose Size: 4AN. Fuel Solenoid: Super PowerShot .