Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 20 000-0NUMBER 40 found under Core Assembly Fluid Cooler by Bauer Compressors Inc. The National Stock Number assigned to this part is 4420013413858, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 20 000-0NUMBER 40.