Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 53D03E5 found under Cap Valve by American Precision Industries Inc. The National Stock Number assigned to this part is 4820011897718, 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 53D03E5.