Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4-131-04-042-001 found under Core Assembly Fluid Cooler by Fluid Handling Llc. The National Stock Number assigned to this part is 4420011900893, 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 4-131-04-042-001.