Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B4B-216-2 found under Plate Identificatio by Fl Aerospace Corp Janitrol Aero. The National Stock Number assigned to this part is 9905009146521, 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 B4B-216-2.