Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CY-1003 found under Cylinder Valve Hydr by G A Industries Inc. The National Stock Number assigned to this part is 4820011958124, 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 CY-1003.