If your hamster, mouse, or gerbil lives in an aquarium, this is the water bottle you need. Bracket adheres to clean, dry aquarium wall and the bottle secures with a snap lock lever. Easy to remove for filling and cleaning. Remember to change your small animal's water daily and thoroughly clean the bottle once a week also be sure that your small animal's aquarium habitat is placed in a well ventilated area, away from direct sunlight. 5 oz. capacity.