Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 25020-179 found under Indicator Air Speed by Mid Continent Instrument Co Inc. The National Stock Number assigned to this part is 6610015836466, and the Federal Supply Class is 6610 Flight Instruments. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 25020-179.