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Nitrous Express NHRA Safety Blow-Off (3000 PSI) Fits All NX Valves w/Female Threads Tail Lamps Grams Performance DBW Electronic 70mmNHRA rules require the safety blow off to be routed outside the vehicle. This fitting replaces the existing safety blow off fitting and allows you to attach a blow down tube to the safety blow off fitting. Fits lightning 45 bottle valve and NX chrome bottle valves with female threads. Disk not included. For chrome valves, use with a new disk (part# 11712). When used with a lightning 45 valve (black), reuse the existing disk in the valve.