Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number WKJ 5120-5528 found under Diaphragm Actuator by Vaf Instruments Bv. The National Stock Number assigned to this part is 4820170567025, 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 WKJ 5120-5528.