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Spill Proof Vacuum Breakers must be 12″ taller than Highest discharge point, piping, and tubing because this High Hazard device cannot prevent against back pressure. Back pressure can also be present with pumps and injector units. This is a situation that the installer of the Spill Proof Vacuum Breaker did not understand the limitations of this type of Backflow Device. The required device for Back Pressure and High Hazard is the Reduce Pressure Backflow Assembly.