Blower Relief Valve Vacuum Capabilities Pressure Preset Limit 222 in wc Outside Diameter 5 in Inlet Size 2 in Inlet Type NPT Compatible Manufacturer Part Number 2VFB40-3.42-7W VFD5-H VFD5-L Compatible Grainger Part Number 22NX92 22NX93 38UW83 Maximum Operating Pressure 15 psi Minimum Operating Pressure 1 psi Overall Length 6.31 in