Ruff Land Water Hole 1 Gallon Dog Bowl - It's a water jug and water dish in one! The Water Hole is a water container that holds up to one gallon of water that is stored in the tower side of the container yet is always available for your dog to drink. It works via a vacuum like an office water cooler. Simply fill it and as your dog drinks the water, that water is automatically replaced from the tower. Will not crack or break if water freezes. Durable roto-molded construction. Handy drain cap also makes it easy to rinse out.