Fuel transfer pumps are powered by AC (alternating current) or DC (direct current) motors for remote or stationary fueling applications. They transfer propellants such as gasoline, kerosene, or diesel. DEF transfer pumps move diesel exhaust fluid (DEF) between containers or fill a vehicle's DEF reservoir. Nozzles for fuel and DEF transfer pumps activate and stop fuel from flowing. Swivels and breakaways prevent hoses from kinking during use or damage to hoses in the event of a drive-off at a fuel station. Filters remove impurities and contaminants that may damage equipment, a vehicle's engine, or the fuel transfer pump. Repair kits and parts keep fuel and DEF transfer pumps operating and in good working order.