Robinair (10994) Heater Blanket For 30 Lb. and 50 Lb. Refrigerant Tanks Robinair's Heater Blanket speeds charging by maintaining a constant temperature, thus creating a positive pressure between the refrigerant tank and the A/C system Fits 30 and 50 pound refrigerant tanks Thermostat is factory set at 125 F (55 C) Thermal cut-off switch protects against overheating 300 watts, 2.6 amps