Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21782 found under Filter Fluid by Purolator Products Co. The National Stock Number assigned to this part is 2940013096052, and the Federal Supply Class is 2940 Engine Air And Oil Filters Strainers And Cleaners Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 21782.