Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 317B found under Valve Assembly Compressor by Dresser Rand Co. The National Stock Number assigned to this part is 4310001456246, 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 317B.