Berkey BK4X2-BB Big Berkey Stainless Steel Water Filtration System with 2 Black Filter Elements INCLUDES: Upper and lower stainless steel chambers, 2 Black Berkey Purification Elements, 2 wingnuts, 2 washers, 1 priming button, stainless steel lid with handle, spigot, and a rubber gasket to protect the base. BLACK BERKEY PURIFICATION ELEMENTS: BB9 purifies the water and has been tested by State and EPA accredited laboratories to exceed NSF/ANSI Standard 53. Made and assembled in the USA, and Warrantied. DURABLE: The unit is highly polished 304 stainless steel. Each Black Berkey Element is designed to purify approximately 3,000 gallons of water before needing replacement; 2 elements in a Berkey system will filter approximately 6,000 gallons of water before replacement is recommended. Elements can be cleaned up to 100 times using a Scotch-Brite pad. SYSTEM: Holds 2.25 gallons and is constructed of highly polished AISI 304 stainless steel. Height: 19.25 inches. Diameter 8.5 inches. The system is Warrantied.