Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 50F-B-3IN-10 found under O Ring by Haywardindl Products Inc. The National Stock Number assigned to this part is 5331013089032, 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 50F-B-3IN-10.