Behlen Mfg All Poly Feed Bunk
All poly feed bunks are roto-molded with extra thick, FDA-approved, food-grade polyethylene that is easy to clean and corrosion free and also feature ribbed, double-wall construction. The deep, rounded feed troughs and drain openings help prevent spoiling of feed and are tested to -20°F. The pluggable drain also allows these bunks to be used as water troughs.
So tough, they come with a two-year warranty against livestock damage.