The gravity feeder has three 8" feed tubes, 3.5" diameter tubes at 9 degree angle and a.75" lip which helps prevent feed spillage.Its hooded overhang shields feed from the elements.There is no need to set timer, maintenance or electronic parts.Hopper has a 30 gallon capacity, twist lock mounting and an easy open lid.Hopper Size: 30 GallonDigital: NoFrame: MetalHousing Material: MetalBarrel Material: Synthetic