Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1278M35P01 found under O Ring by E I Du Pont De Nemours And Company. The National Stock Number assigned to this part is 5331011742678, 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 1278M35P01.