Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number OR13 3X2 4-72NBR 872 found under O Ring by Auto Buerling Gmbh. The National Stock Number assigned to this part is 5331121224261, 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 OR13 3X2 4-72NBR 872.