Blower Relief Valve Vacuum Capabilities Pressure Preset Limit 443 in wc Outside Diameter 5.7 in Inlet Size 2 1/2 in Inlet Type NPT Compatible Manufacturer Part Number 2EPT4 2EPT5 Compatible Grainger Part Number 2EPT4 2EPT5 Maximum Operating Pressure 15 psi Minimum Operating Pressure 1 psi Overall Length 7.81 in