Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number EPR13 AND RX173 found under Valve Regulating Sy by Emerson Electric Co. The National Stock Number assigned to this part is 4820013104284, 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 EPR13 AND RX173.