Miller’s Plastic Dome Waterer 10 gallon is best suited for adult birds. Made of strong, heavy-duty plastic. Top-fill design is easy to use. Valve in base controls water flow close when filling, then open to allow water to fill the base. For best results, set waterer on flat ground before filling and do not allow water to freeze. Accommodates between 100-120 chickens, also good for ducks or other poultry. Holds up to 10 gallons of water.