Blower Relief Valve Vacuum Capabilities Vacuum Preset Limit 220 in wc Outside Diameter 5 in Inlet Size 2 in Inlet Type NPT Compatible Manufacturer Part Number 2EPP2 2EPP3 2EPP6 2EPP7 2EPR3 2EPR4 2VFB60-8.4-7W Compatible Grainger Part Number 2EPP2 2EPP3 2EPP6 2EPP7 2EPR3 2EPR4 38UW81 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