Habitrail OVO Water Bottle is an easy-to-access and easy-to-maintain add-on that features a large, overhead 450 mL water reservoir and a leak-proof, stainless steal nozzle that provides hamsters with a continuous water supply. OVO offers a variety of uniquely-designed add-ons that will increase your hamster's quality of life. The elaborate world of OVO consists of a variety main habitats, add-ons, trails, and chewable mazes that are easy to assemble—in as little as 60 seconds in some cases—thanks to our exclusive Lock Connectors, that allow quick and easy connections. Built on Habitrail's long-standing reputation for innovative hamster habitat designs, OVO provides a variety of amazing and entertaining living spaces for hamsters. Based on extensive behavioral studies, Habitrail OVO housing and accessories are designed to help enhance your pet hamster's quality of life. Completely redesigned, re-tooled and reinvigorated, OVO brings even more interesting and entertaining venues in which hamsters can explore, burrow, snooze, exercise or simply chill out.