This Miraco Livestock Waterer 20 gallon is both a thermos and a watering hole for your livestock. When the water enters the MiraFount and the closures float up and seal off the drinking ports, the MiraFount becomes a thermos for livestock. Whenever an animal drinks, it removes a quantity of water which is immediately replaced by ground water through the valve. This exchange of water keeps the water warm, even in the coldest climate, and cool in warm climates. This particular tank can water 100 head of beef cattle or 40 dairy cows. Includes stainless steel anchor bolts.