Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1023D0221 found under Rodmeter Selector by L 3 Chesapeake Sciences Corporation. The National Stock Number assigned to this part is 6605010940070, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1023D0221.