Omnipure is recognized throughout the world as the premier manufacturer of inline water filter cartridges. Incorporated into every Omnipure filter body design are engineering features that make Omnipure products the best, most cost-effective inline water filters on the market. The self contained filters are labeled with a model number on the filter body. A inline filter marked BB is for female type connections and a inline filter marked JJ has a 1/4 inch built in push in hose connection. Proudly made in the USA.