Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6665490 found under Valve Lift Check by Melroe Co. The National Stock Number assigned to this part is 4820014697738, 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 6665490.