Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 31-1616-0404 TAN 214 found under Case Water Purification Kit by Hardigg Industries Inc. The National Stock Number assigned to this part is 4610014074858, 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 31-1616-0404 TAN 214.