Timers 1 Grounded Outlet Operational Down to -40 Degrees Fahrenheit 24 Hour Heavy Duty Plug-in Ideal for Engine Block Heaters GE Extreme Weather Outdoor Mechanical Timer Outdoor Lighting and more 31277 Electrical
Amazon.com: Zerostart 8605556 Heavy Duty Engine Block Immersion Heater for Caterpillar, Detroit Diesel, International/Navistar and Perkins Engines, 1" NPT Thread | 120 Volts | 1500 Watts: Automotive