Wolverine Heaters - Model FH-100 - 100 Watts - Fuel Filter Heater - 12 Volts 100% Satisfaction Guarantee - Made in USA - 2 Year Warranty Eliminates diesel fuel gelling at cold temperatures Eliminate cold starts. Faster - easier - hotter engine cranking in cold weather. Tested to -30 degrees. Easy peel & stick application. Installs in minutes, no tools required, no hoses to cut. Apply to flat METAL only. Environmentally Friendly - Reduces start up smoke and harmful emissions