Method Method of use】 Quick installation, quick release, just close two valves, put the connector in the open position, you can just separate the aquarium and the filter, easier cleaning. 【With Cleverish control valve】This aquarium hose quick release connector with water flow control valve, which allows you to control the flow of water through your hose and completely shut it off as desired. < p>【Application】 Suitable for fresh and salt water, can also be used for devices such as filters, pump return lines, protein skimmers etc. 【3 sizes to choose from】 Multiple choices of different specifications, 12mm valve is suitable for the hose with inner diameter 12mm/0.5inch and outer diameter 16mm/0.6inch. Materials Qualitative Materials】Made of high quality plastic with special design, durable and long lasting product with reasonable price. Water leak proof, rust and corrosion resistant, polished surface allows you to grip comfortably without hurting your hands.