Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number XC709-B4B found under Cage Valve by Emerson Electric Co. The National Stock Number assigned to this part is 4820010911459, 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 XC709-B4B.