Hozelock Pro Metal Waterstop Connector is strong, durable and scratch resistant thanks to the zinc die cast sleeve. The Aqua Stop connector incorporates an internal valve that stops the water flow when an accessory is disconnected. Suitable for use with all 12.5mm 1/2" and 15mm 5/8ths" hose. All internal parts are made from ultra tough engineering plastics for a long leak free life. The connection to the tap is guaranteed secure up to 10 bar, thanks to a triple locking system. Hose kinking, hose swelling, and hose leaking at the connection point with the fitting is virtually eliminated due to the ingenious flexible hose-tail on the nut.