Blower Relief Valve Vacuum Capabilities Vacuum Preset Limit 136 in wc Outside Diameter 5 in Inlet Size 2 in Inlet Type NPT Compatible Manufacturer Part Number 2VFB30-1.2-5T 2VFB30-1.2-7W VFD6-L VFZ801A-5W VFZ801A-7W Compatible Grainger Part Number 22NX94 38UW84 38UW85 53WC15 53WC16 Maximum Operating Pressure 28 in Hg Minimum Operating Pressure 1 in Hg Maximum Operating Temperature 400 Degrees F Minimum Operating Temperature -20 Degrees F Overall Length 5.81 in