The Hozelock Aqua Stop connector has an internal valve that stops the water flow when an accessory such as a spraygun is disconnected. This saves you having to go back to the tap to turn the water off when you are switching between accessories. It also helps you save water in the garden because it stops the water flow so less water is wasted. Suitable for use with all 12.5mm 1/2 inch and 15mm 5/8 inch hose. All internal parts are made from ultra-tough engineering plastics for a long leak free life. The connection to the tap is guaranteed to remain secure up to 10 bar thanks to a triple locking system.