Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1066021 found under Stem Tuning Receive by Aeronautical Instrument And Radio. The National Stock Number assigned to this part is 4820008322531, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1066021.