FATPET Durable Pet Bottle Head Convenient and Portable Drinking Water Fountain for Small Animals Measure: 13cm x 6cm x 9.1cm / 5.1"x 2.4" x 4.3" / nozzle diameter: 10mm Comes with a long lasting no-leak stainless steel tip, smallr-sized nozzle is recommended for small animal, such as hamster, ferret, guinea pig, etc It's easy to install, and you can easily snap the water Bottle on or off for cleaning and refilling water. Its top fits most standard water bottles and with screws, it can be fixed in any place , such as walls, wood, cages, etc With a roller ball style nozzle that can dispenses water as pet licks, very easy and convenient for your pet to drink