Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number OR3.68X1.78-70FPM found under O Ring by Eriks Bv. The National Stock Number assigned to this part is 5331170557631, 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 OR3.68X1.78-70FPM.