Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2000-4 found under Valve Angle by Eg And G Inc. The National Stock Number assigned to this part is 4820004411222, 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 2000-4.