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 Note: Designed to "Purge" line at solenoid,Includes all required components.Before you begin make sure that your bottle valve is closed. and your main feed line is empty .