If the connected gardena watering accessory is disconnected, eg a brittle or sprinkler, the water supply stops automatically if an accessory is connected, the water flows again. When changing accessories, you do not have to walk to the tap. This waterstop is suitable for 19 mm 3 by 4 hoses Power Grip Specially shaped swivel nut for easy installation and very strong hose connection, with ridges of soft plastic for comfortable use. A rubber ring gives the product extra protection.