Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number GTI 1657 found under Cooler Fluid Transmission by Thermasys Corporation. The National Stock Number assigned to this part is 3040012821745, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like GTI 1657.