Blower Relief Valve Vacuum Capabilities Vacuum Preset Limit 82 in wc Outside Diameter 5 in Inlet Size 2 in Inlet Type NPT Compatible Manufacturer Part Number VFC300A-5W VFC300A-7W VFC400P-5T VFZ401A-5W VFZ401A-7W Compatible Grainger Part Number 4Z751 53WC07 53WC08 5JEP1 5Z649 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