Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number T023521 FC found under Disk Valve by Northern Indiana Business Services. The National Stock Number assigned to this part is 4820015361478, 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 T023521 FC.