The double cylinder drinkers are made of high strength polyethylene. They allow for very easy filling, with no more inverting required. These models also feature the well-known and proven bayonet lock and are suitable for hanging up. The diameter is 31 cm. Your Hauptner team recommends these easy-to-clean drinkers for use with chickens, turkeys, and ducks. Made in Germany, original Stükerjürgen.