Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2870-B found under Valve Assembly Pump by Durabla Mfg Co. The National Stock Number assigned to this part is 4320004469850, and the Federal Supply Class is 4320 Power And Hand Pumps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 2870-B.