Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 426645 PIECE 26 found under Disk Valve by Western Filter A Division Of. The National Stock Number assigned to this part is 4820011666873, 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 426645 PIECE 26.