Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 89B7641-4 found under O Ring by Bhv Aviation Consultants Gmbh. The National Stock Number assigned to this part is 5331015162230, 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 89B7641-4.