Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2143 found under Valve Plate Air Compressor by Smith E L And Sons Co. The National Stock Number assigned to this part is 4310011422328, 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 2143.