The Water Stop is connected to the hose outlet. When a connecting device is disconnected, e.g. a nozzle or sprinkler, it stops the water automatically; when a device is connected, the water flows freely again. This saves a trip to the tap when changing accessories. The Water Stop is suitable for 13 mm (1/2") hoses. Specifications: High quality ABS plastic Fast, easy exchange of watering accessories Auto-stop water function Soft-grip Fits 1/2" hose Hozelock compatibile