New Pro Metal quick connect hose connectors are class leading products. Thanks to the zinc die cast sleeve the Pro Metal Aqua Stop is strong, durable and scratch resistant. The large bump ring protects greenhouses and cars from damage. The Aqua Stop connector incorporates an internal valve that stops the water flow when an accessory (eg a spraygun ) is disconnected. This saves you having to go back to the tap to turn the water off when you are switching between accessories. It also helps you save water in the garden because it stops the water flow so less water is wasted.