Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 281539-0001 ITEM NO. 62 found under O Ring by Marotta Controls Inc. The National Stock Number assigned to this part is 5331006843419, 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 281539-0001 ITEM NO. 62.