Blower Relief Valve Vacuum Capabilities Vacuum Preset Limit 68 in wc Outside Diameter 5 in Inlet Size 2 in Inlet Type NPT Compatible Manufacturer Part Number VFC200A-7W VFC200P-5T VFC300P-5T Compatible Grainger Part Number 4Z750 5F242 5Z187 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