Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 28P-1-050-B3-16121 found under Filter Fluid by Parker Hannifin Ltd. The National Stock Number assigned to this part is 2945015626015, and the Federal Supply Class is 2945 Engine Air And Oil Filters Cleaners Aircraft Prime Moving. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 28P-1-050-B3-16121.