Pressure, Vacuum and Temperature Specifications

BREATHER VALVE
Opens at a fuel tank pressure of 30 - 50 mbar (22.5 - 37.5 mmHg)
Opens at a fuel tank vacuum of 1 - 16 mbar (1 - 12 mmHg)
Closed when no vacuum and less then 30 mbar (22.5 mmHg) pressure