Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number E3R .50IPS found under Valve Regulating Temperature by Spirax Sarco Inc. The National Stock Number assigned to this part is 4820002767866, 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 E3R .50IPS.