The Tough Guy multi-purpose automatic float pet waterer holds 5.7 litres of water. It attaches to any garden hose and provides a constant source of fresh water for your pet at all times. 
It simply attaches to a wall or fence and will not overflow.
Made from heavy duty, high-density polypropylene, the Tough Guy Automatic Waterer has a large drain with twist plug  so that when needed you can clean it quickly.
This water system does need to be mounted to your wall or fence.