Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B90-113 found under Ring Piston by Duchesne Inc. The National Stock Number assigned to this part is 4310015667570, 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 B90-113.