GARDENA Stop Quick Coupling is connected to the tire outlet. When a connection device is disconnected, e.g. a nozzle or a pistol, stops the water automatically. When a device is connected, water flows freely again. This saves a trip to the tap when changing parts. The Stop Quick Coupling is suitable for 13 mm (1/2 ") and 15 mm (5/8") tires. POWER GRIP: Specially designed sleeve for very good fit and assembly without problems. Thanks to the soft plastic handle with grooves, the GARDENA Quick Connector fits well and safely in the hand. The Quick Link is protected by a rubber ring that prevents damage.