Choco Nose H125 Patented No Drip Hamster Water Bottle. Best Mini-Sized Pet Water Feeder for Hamster/Hedgehog/Sugar Glider/Rat/Mice. BPA Free. Mess Free. 11.2 Oz. Nozzle Diameter: 10mm US Patent- Patented leak-proof nozzle / BPA Free Small-sized nozzle is perfect for small animals, especially for hamster Screw-on bracket: Insert the drinking tube through the wire cage side or crate door, add the screw-tight bracket by checking position of the brackets snap-fit attachment, and tighten the screw fitting from inside the cage. Then you can easily snap the water feeder on or off for cleaning and refilling. Nail-on bracket: It may also be nailed to the wall or wood doghouse with screws provided. Eco-Idea- Nozzles can fit most regular PET bottles