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. Accommodates 40 up to 120 chickens. Also good for ducks or other poultry. Holds 5-10 gallons of water based on waterer size.