Pet Bottle, FATPET&reg; 400ml /13.5oz Rear-filling Pet Water Bottle with 16mm Nozzle (blue) Leak-proof nozzle (nozzle diameter:16mm) / 400ml (13.5oz) /Rear-filling / Recommend for Small-sized Dog / Medium size Rabbit / Not recommend for guinea pigs or hamsters Insert the drinking tube through the wire cage side or crate door, add the screw-tight bracket by checking position of the bracket's 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 Made of animal safe, high quality and durable plastic materials, stainless steel tube, absolutely don't have unpleasant smell It's can hang on your pet cage, and with screws, the bottle can be fixed in any place , such as walls, wood, etc Easy to adjust the height of the water bottle to fit your pet