Choco Nose H128 Patented No Drip Small Animal Water Bottle. Best Water Bottle for Small Pet/Bunny/ Ferret/Hamster/ Guinea Pig/Critter. BPA Free. Mess Free. 11.2 Oz. Nozzle Diameter: 10mm U.S. Patented Leak-proof Nozzle/ No Drip Small Pet Water Bottle / BPA-free / 11.2 oz Capacity Mini-Sized Nozzle (10mm) is recommended for Guinea Pig, Ferret, Hamster, Bunny User-Friendly Screw-on bracket: Simple and Easy Installation. You can easily snap the water Bottle on or off for cleaning and refilling water. Nail-on bracket: It may also be nailed to the wall or wooden furniture with screws. Eco-Idea: Pet owner can switch our bottle to most regular sized PET bottles (Soda Bottle). Important Instruction: Please check the water bottle daily and after every refill by tapping the metal ball inside the nozzle to ensure water comes out. The water bottle is ready to use when air bubbles occur as you tap the metal ball.