Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 203321 found under Valve Regulating Temperature by Fairchild Corp. The National Stock Number assigned to this part is 4820001632912, 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 203321.