A totally different concept in small animal water bottles! All E-Z-Top bottles come packaged with two sturdy clip-on style brackets. The hanger bracket uses a simple hook arrangement that fits over the cross wires on most cages. The threaded bracket uses a large threaded knob that screws onto the bracket, providing a very secure mount. The bottle easily clips on and off of both brackets without removing the brackets themselves. Choose the bracket that best suits your situation, or use both brackets at the same time. The Oasis E-Z-Top Water Bottles feature a new water chamber design with a standard ball-point drinking tip. The precision stainless steel ball creates a perfect seal with the built-in rubber o-ring, while the special water chamber behind the tip maintains a balanced vacuum. Now, for the first time, you can fill a ball-point bottle from the top! Can also be used for dog and cat crates.