Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A3.4065-1.250IN-ITEM 6 found under O Ring by Young And Cunningham America Inc. The National Stock Number assigned to this part is 5331015370215, 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 A3.4065-1.250IN-ITEM 6.