Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number KS2503-160AS found under Fan Centrifugal by Rotron Controls Div Rotron Inc. The National Stock Number assigned to this part is 4140008222864, and the Federal Supply Class is 4140 Fans Air Circulators And Blower Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like KS2503-160AS.