Prevent cold weather gelling of your fuel system with BD's PTC Heating element. Sandwiched between the water separator, pre - filter andor the filter head, the BD fuel heater is perfect for cold weather warriors. The premade wiring harness with sealed electrical connectors offer quick and easy install. The self - regulating 320 watt heater has over 3x the amount of heating power of other single systems and at a lower price. BD Diesel has a universal heater that is compatible with BD Flow Max, Air Dog and Fass fuel pump assemblies