Do you lose time and money because your vehicle or equipment won't start due to diesel or biofuel gelling in cold weather? Fuel filter heaters help reduce the problem by heating the diesel or biofuel at the filter. Apply a filter wrap directly on the filter and preheat 15-30 minutes prior to engine start to prevent filter clogging and keep fuel flowing at startup. Also great for marine and farm equipment applications, small home generator sets, portable generators, portable light towers and welders. Made in USA. 1-year 100% satisfaction.