Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 111-0020-03 found under Valve Pneumatic Tank by Erie Engineered Products Inc. The National Stock Number assigned to this part is 4820002424064, 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 111-0020-03.