Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4025 found under Cooling Tube Vortex by Exair Corporation. The National Stock Number assigned to this part is 4150015364753, and the Federal Supply Class is 4150 Vortex Tubes And Other Related Cooling Tubes. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4025.