Check out our winter freeze proof livestock water system. With a 50-gallon portable tank, Jobe Megaflow valve and a syphon hose, this system is watering 338 head of cows. It was 15 below zero wind chill last night and the water never froze. We absolutely love this winter water method that works no matter how cold it gets. For more grazing info check out my new book " How To Think Like A Grazier" on our website: http://greenpasturesfarm.net/books/