Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SA4204-2 found under Expander Ring by Acco Industries Inc. The National Stock Number assigned to this part is 1650006078445, and the Federal Supply Class is 1650 Aircraft Hydraulic Vacuum And De-Icing System Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SA4204-2.