The Nitrous Express Xtreme purge valve with 1/4" poly line (4AN) includes a Lightning purge solenoid, a 4AN manifold, push button and vent tube as part of the NX purge system. Purging air from the nitrous line promotes harder launches and improved 60-foot times and is noted by the manufacturer as a tuning element that can reduce quarter-mile elapsed times by up to two tenths in supportive applications.
Nitrous Express Xtreme Purge Valve w/1/4in Poly Line (4AN)