Robinair's No. 10994 Heater Blanket speeds charging by maintaining a constant temperature, thus creating a positive pressure between the refrigerant tank and the A/C system. Blanket fits 30 and 50 pound refrigerant tanks. Thermostat is factory set at 125 F (55 C) and built in thermal cut-off switch protects against overheating. 300 watt, 2.6 amp rating. Robinair, a Bosch Automotive Service Solutions brand, is a global leader in service tools and equipment based in Owatonna, Minnesota. Robinair is recognized throughout the world as the quality and performance leader in AC/R evacuation tools and this position has led to its success with the full range of products that serve the heating/ventilating/air conditioning/refrigeration (HVAC-R) and mobile markets, which includes the automotive aftermarket along with other industries such as agriculture and construction.