Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 31703 WD 1956 found under Cleaner Vacuum Electric by Emerson Electric Co. The National Stock Number assigned to this part is 7910016114698, 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 31703 WD 1956.