Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D-6433 ITEM 1 found under Heat Exchanger Comp by W B Arnold Company Inc. The National Stock Number assigned to this part is 4310012592064, and the Federal Supply Class is 4310 Compressors And Vacuum Pumps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like D-6433 ITEM 1.