The Power Products Plug Filler Cap is designed to provide a tight and secure seal on the vehicle's tank or reservoir, preventing any leaks or spills that could lead to fuel wastage or environmental hazards. The filler cap acts as a barrier against dust, dirt and other debris, helping to keep the interior of the tank clean. The tight-sealing filler cap also minimizes fuel evaporation, especially in hot weather conditions. FleetPride is your First Click in Heavy Duty®.