Feature 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. Kits Includes: Purge solenoid, 4 AN adapter fitting, Push-button activation, NPT fitting, NPT to compression fitting, 3/16'' dia. Stainless Tubing 7'' long and Accessories. 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. .