Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 288U0440 found under Valve Assembly by Koehring Co. The National Stock Number assigned to this part is 4820004707397, 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 288U0440.