Method of useQuick installation, quick release, just close two valves, put the connector in the open position, you can simply separate the aquarium and the filter, easier cleaning. With Cleverish Control ValveThis aquarium hose quick release connector with water flow control valve, which allows you to control the flow of water through your hose and completely stop it as you wish. want. ApplicationSuitable for freshwater and saltwater, can also be used for devices such as filters, pump return lines, protein skimmers, etc. 3 sizes for you to chooseMultiple choices of different specifications, the 12mm valve is suitable for the hose with inner diameter of 12mm/0.5 inch and outer diameter of 16mm/0.6 inch. Quality MaterialsMade of high quality plastic with special design, pro durable and long lasting product at a reasonable price. Water leak proof, rust and corrosion resistant, polished surface allows you to grip comfortably without hurting your hands.