Blower Relief Valve, Vacuum Capabilities Vacuum, Preset Limit 42 in wc, Outside Diameter 1.5 in, Inlet Size 1 1/2 in, Inlet Type NPT, Inlet Gender Female, Compatible Manufacturer Part Number VFC400A-7W, VFC400P-5T, Compatible Grainger Part Number 4Z751, 4Z752, Overall Length 6.25 in