Items such as water pumps, water compartments, hose reels and waterlines used on vacuum trucks can freeze and fail during winter months while servicing portable restroom and septic tanks. However, installing double-insulated lines from Best Enterprises that run from the truck’s radiator to the heated coils installed inside the water compartment, heated water collars and waste dumps, allows warm water/antifreeze to flow through the system, keeping the equipment operational in freezing weather. Having the heated collars on the waste dump and water dump valves allows for operations such as sucking out waste, washing out portable restrooms and dumping waste in freezing conditions. Placing high-pressure water pumps, washdown pumps, vacuum pumps and hose reels inside insulated stainless steel or aluminum boxes with DC heaters can keep pumps and lines from freezing. This DC electric heater has a three-speed fan motor, so the heat can be adjusted. 501-988-1905; www.bestenterprises.net.