Racer Safety Blow-Off Valve Adpater
8AN 2nd & 3rd Gen Hi-Flo & Super Hi-Flo

Any ANDRA sanctioned track will require these blow-off caps in all classes when you run with nitrous oxide. These are safety devices that fit on the bottle. If your nitrous system creates too much pressure, one of these caps will allow it to bleed off through the vent tube, which exits outside the vehicle.