What is a purge valve and do I need one?
A. The purge valve is an auxiliary nitrous solenoid that is activated manually by the driver prior to a nitrous assisted pass. This solenoid vents the gaseous nitrous from the supply line that connects the nitrous bottle to the nitrous solenoid. This allows a pure liquid nitrous charge to enter the engine for an instant surge of power. A purge valve is worth about a tenth of a second on a quarter mile pass. Yes, everyone needs a purge valve.