Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number OR55X3 72NBR 872 found under O Ring by Freudenberg Nok General Partnership. The National Stock Number assigned to this part is 5331121415107, 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 OR55X3 72NBR 872.