No mess; no spills The Clean Water and Clean Seed silos allow you to provide your bird with an ever-flowing supply of water or seed. The unique design allows you to will the silo from the outside; no reaching into your birds cage Made from sturdy; safe acrylic. Available in small and tall sizes; easily fits all cages; vertical and horizontal bars. For Parakeets; Canaries; Cockatiels; Finches and similar sized birds. Size: Reservoir is 1" diameter x 4" high.