The design of the Habitrail OVO Water Bottle is easy for you to fill and for your hamster to drink. It is designed to be placed away from your hamster's living area, so his living space stays dry and comfortable. The Habitrail OVO Water Bottle is designed with a stainless steel nozzle and provides water by gravity only, so the hamster doesn't need to push a ball to access its water. Feel free to add more than one Habitrail OVO Water Bottle to your pet's home, so it has multiple destinations to choose from.