Miller Manufacturing Plastic Poultry Fountain - 3 gal. This large-capacity Automatic Poultry Waterer features a vacuum-sealing O-ring cap that creates an automatic water flow. Made of dent-proof, heavy-duty translucent plastic that allows you to see the water level. The easy-to-fill jar snaps compactly onto the base, and the rugged handle makes transport around the yard easy. This is a durable unit that will stand up to plenty of use. 16 inch-diameter octagon by 14.75 inch high, holds 3 gallons.