6680-01-537-8659 (822-13-OV1-PV1-V1-RD(3)-N250SCCM)
6680-01-537-8659 is equivalent to manufacture part number 3. It is a flow rate indicating meter and is classified under Federal Supply Class 6680 (6680 - Flow and Level Measuring Instruments), stocked for defense, aerospace, MRO, and industrial maintenance applications. This item is cataloged in the NATO supply system under 6680 - Flow and Level Measuring Instruments and is available through NSN-PARTS for U.S. government MRO, and commercial procurement.