Suitable for freshwater and saltwater, can also be used for devices such as cartridge filters, pump return lines, protein skimmers, calcium reactors, etc. Only the rotation of the hose connector connects to your faucet, does not need any tools and no matter indoors or outdoors, without water leakage. Subbertized coating allows you to grip comfortably and prevent rust. Made of premium plastic with special design, it is durable and easy to use, just rotate 90 degrees from the fully closed position to fully open position. This fish tank water flow control valve is a good product for keeping fish.