Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3F1 082 ITEM 20 found under O Ring by Man Diesel And Turbo Ltd. The National Stock Number assigned to this part is 5331013960611, 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 3F1 082 ITEM 20.