Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ABC3-550-500-337-FBJ-1 found under Diaphragm Actuator by Bellofram Corporation. The National Stock Number assigned to this part is 4820013648914, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like ABC3-550-500-337-FBJ-1.