Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number F28-10 TYPE BF found under Breather Vehicular by Allied Witan Co. The National Stock Number assigned to this part is 2520011496689, and the Federal Supply Class is 2520 Vehicular Power Transmission Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like F28-10 TYPE BF.