The dust valve uses gravity and pressure to help eliminate dirt from the air cleaner. Typically, this valve stays closed until the engine is turned off or pulsations trigger the valve to open. The valve is attached directly to the dust port on an air cleaner.Attributes:• Easy maintenance and serviceability• Made from durable and robust materials• Resistant to damage from ultraviolet rays, dust, and other debris • Typically used with two-stage air cleaners