Our energy-free waterers feature our exclusive double-seal system that includes an aqua seal and foam gaskets to ensure an airtight seal between the lid and the base. The patented door closure system prevents freezing in the winter,mosquito breeding and spreading West Nile Virus in the summer,and bird contamination all year round. What’s more,the patented door design allows for ease of use by livestock without the learning curve necessary for other designs. Specifications 41'' x 23'' x 20'' 15'' Drinking Height 22 Gallon Capacity Door Openings (2): 9.5'' x 9.5''