Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D50281 found under Cartridge Kit Water by Barnstead Thermolyne Corporation. The National Stock Number assigned to this part is 4610015270043, 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 D50281.