The 350lb. capacity hopper has a thick wall of HDPE UV Protected plastic that will not rot, rust or leak! This maintenance FREE hopper system is the BEST SELLER in our line. With our Patented Free Choice Protein / Gravity Head you get the most moisture resistant free choice feeding system available on the market today ! The Custom Designed head features a 10° of angle, and a 1 in overhang on the 4 in I.D. feed ports. Each feed port has a drain hole to disperse any water that enters the tip of the feed port. Our patented design features an internal cone that dispenses the feed evenly to the three ports. The 3-Way inner sleeve allows the user to control the feed flow of almost all feed shapes and sizes. Push it all the way up to virtually shut off the flow, or ease it down until you get the optimal flow on your favorite type of critter food. Our double walled hatch LID tops this unit off in style, and function. Built oversized, this lid allows the hopper system to breath, thus eliminating condensation while achieving ambient temperature faster than Steel or Fiberglass feeders.