Check Valve, 1/2 In., Series Not Applicable, Compatible with Grainger Part Number Not Applicable, Product Type Check Valve, Compatible with Manufacturer Part Number AD0071, AD0073, AD0101, AD0103, AD0151, AD0153, AD0203, AD0303, AD0304, AS0071, AS0101, AS0151, AS0202, AS0203, AS0303, Compatible with Series Speedaire, Compatible with Brand Powerex