Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MODEL 2 found under Demineralizer Water Ion Exchange by Siemens Industry Inc. The National Stock Number assigned to this part is 4610005266574, and the Federal Supply Class is 4610 Water Purification Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MODEL 2.