This high quality inline water filter is designed to provide crystal clear great tasting drinking water. The openings on this filter are 1/4" FPT standard threads and will fit any 1/4" male pipe thread fittings. This filter also contains 100% Calcite. This filter has been tested to 6,500 gallons of performance for remineralization. This testing assures you the customer that you are receiving the highest quality product available and in testing it has passed various ANSI/NSF Standard structural tests which insure that this filter meets the rigorous requirements set within the standard to help insure that this filter will remain leak free. Compare this filter to similar products sold under brand at your local big-box retailer for many times the price. These filters are great for use behind your refrigerator, and for use with small automatic coffee making equipment and ice machines.