Hozelock Aquastop Quick Connect Fitting For 12.5mm & 15mm With AquaStop Function Made from the highest quality materials, the Hozelock AquaStop quick connect hose end connector can be attached to 12.5mm and 15mm diameter hose. Built to fit most male ended connectors, it can be securely attached in seconds and can be detached with a simple pull down of the yellow body. Hozelock's water stop connector fits with 12.5 mm and 15 mm Hoses Built to fit most male ended connectors, it can be securly attached or detached in seconds with Hozelock's quick connect system Stops the water flow when an accessory (e.g. a spraygun ) is disconnected Made from the highest quality materials for increased durability Use at the hose end attachment end of the hosepipe for best results The AquaStop connector has an internal valve that stops the water flow when an accessory (e.g. a spray gun) 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. This fitting is best used at the Hose Gun attachment end of the hosepipe.