Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 505040-01-4 found under Actuator Valve by Tri Tec Manufacturing Llc. The National Stock Number assigned to this part is 4820016047439, 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 505040-01-4.