While the unit is factory calibrated at 9 PSI

As a direct replacement for the Honeywell 305914/U

As a veteran-grade HVAC furnace part

As a mainstay in the ASCO RedHat series

Spirax-Sarco 0190190 Vacuum Break 30067439-890 While the unit is factoryThe Spirax Sarco 0190190 is a specialized VB14 Vacuum Breaker engineered to protect industrial steam plant and process equipment from the structural risks of vacuum formation. This 1 2 NPT brass bodied valve is a critical safety component for condensing vapor systems, including heat exchangers, jacketed kettles, and air coils. When system pressure drops below atmospheric levels, the precision ground stainless steel valve instantly lifts from its seat,