It is suitable for fresh and salt water and can also be used in tank filters, pump return lines, protein separators, calcium reactors and other equipment.Just twist the hose connector to connect to your faucet, no tools required, indoors or outdoors, no leaks.Subberized coating gives you a comfortable grip and prevents rust.Made of specially designed high quality plastic, durable and easy to use, just rotate it 90 degrees from fully closed to open position.