Fitment: 16030NOS-4AN line purge valve kit is suitable for "purging" nitrous oxide at the solenoid and helps to release trapped air or gaseous nitrite from the feed line Features: 1) 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 2) 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 .