The Boss Buck 350 lb. All-In Gravity Rotomolded Protein Feeder is constructed of Tough Roto-Molded HDPE UV-protected plastic that won't rot, rust or leak--the same process used to make white water kayaks! Virtually maintenance-free, this best-selling protein feeder converts between gravity and automatic in just minutes. Boss Buck's patented Free Choice Protein/Gravity Head makes this protein feeder the most moisture-resistant free choice feeding system available. The custom-designed head on the protein feeder features a 10-degree angle and 1 in. overhang on the 4 in. feed ports. Any water that enters the tip of the feed port is dispersed through a drain hole in each port. This patented design features an internal cone that dispenses the feed evenly to all 3 ports. Get the job done right with this protein feeder! Protein feeder is constructed of HDPE UV Protected Plastic Protein feeder features all galvanized hardware Lid features loose fit to allow proper ventilation Protein feeder features a four piece leg system for quick conversion 3 port feeding system Protein feeder provides a feeding height of 40 in.