Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B 0550 found under Belt Blower Drive by Liebert Corp. The National Stock Number assigned to this part is 3030013720444, and the Federal Supply Class is 3030 Belting Drive Belts Fan Belts And Accessories. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B 0550.