Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MS28778-2 found under O Ring by Mke Agir Silah Ve Celik Fabrika. The National Stock Number assigned to this part is 5331008037208, 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 MS28778-2.