Water is not easy to backflow so it wont get dirty. Marukan rabbit water bottle 10.1 fl oz (300 ml); Target rabbits, chinchilla, etc. Features: A water supply device with a double layer structure and a smooth flow of water. The suction port has 2 stainless steel balls inside, which prevents backflow and keeps the bottle clean. You can reuse plastic bottles (6.8 - 16.9 fl oz (200 - 500 ml) of commercially available drinking water. Comes with a hanging hole so you can hang it from the top of the surface. Quantity: 1 piece; Size (W x D x H): Approx. 2.2 x 3.3 x 8.7 inches (55 x 85 x 220 mm) (including nozzle and holder); Capacity: 10.1 fl oz (300 ml); Material: Bottle body: PVC; Nozzle holder; Stopper: Polypropylene; Suction hole: Brass plated; Suction ball: Stainless steel; Gasket: Rubber. Country of Origin: Taiwan