Guard your fuel system against cold weather gelling with BD's PTC heating element. Positioned between the water separator, pre-filter, and/or the filter head, this BD fuel heater is ideal for cold weather conditions. The pre-made wiring harness, complete with sealed electrical connectors, ensures quick and easy installation. The self-regulating 320-watt heater boasts over three times the heating power of other single systems at a lower price. BD Diesel offers a universal heater compatible with BD Flow Max, Air Dog, and Fass fuel pump assemblies.