The Zex Safety Blow Down Kit ensures maximum safety for your nitrous powered hot rod. If your bottle is ever over-filled, or over-heated and the pressure safety disk bursts, the dangerous over-pressure will safely vent to the outside of the vehicle. All racetracks require these blow down kits and they are a must for the serious competitor. The Zex Safety blow down kit is a complete kit that makes installing this important safety item a simple task.