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The Big Blue II is a fully insulated heated automatic nipple waterer. It is the only heated watering unit offered by Trojan that is approved for year-round, indoor and outdoor use. The thermostat in the Big Blue II senses the temperature of the nipple instead of the air temperature in order to prevent freezing even in subzero temperatures. The Big Blue II also features a patented supply line heating system and water-saving shields to reduce waste from the animals taking the nipple into the side of their mouths.