Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1743226 (BX 4 EA found under Cleaning Compound Pre Soak by Birsch Industries Inc. The National Stock Number assigned to this part is 7930015213738, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1743226 (BX 4 EA.