Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 870728A found under Filter Element Intake Air Cleane by Nelson Industries Inc. The National Stock Number assigned to this part is 2940015131502, 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 870728A.