The GARDENA Water Stop is connected to the end of the garden hose. If a connecting device, such as a sprayer or a watering device, is disconnected, the water is automatically stopped; as soon as a device is connected again, the water can flow freely again. This means that you do not need to run to the tap when changing accessories. The water stop is suitable for 13 mm (1/2") and 15 mm (5/8") hoses. POWER GRIP – Specially shaped union nut ensures very high hose holding power and easy installation. Thanks to the grooved grip made of soft plastic, the GARDENA Water Stop sits firmly and securely in the hand. The water stop is provided with an elastic ring to protect it from damage.