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Nitrous Express nitrous purge valve kit includes a 4AN manifold, push button and vent tube to provide purge capability where solenoids lack built‑in purge ports. The NX purge system description notes that purging air from the nitrous line can allow harder launches and quicker 60‑ft times, potentially shaving measurable tenths from elapsed times under the right conditions.
Nitrous Express Nitrous Purge Valve (4AN Manifold Push Button and Vent Tube)
