Product Details: Update your semi truck with a fresh new purge valve for its pneumatic system, with the Wabco 12V Air Dryer Purge Valve Kit that ensures you're Ready for the Road Ahead™. To ensure the pneumatic system is clear of contaminants, this replacement device expels the contaminated air that has been captured by the filter. Fashioned with top-quality materials to ensure a long-lasting service life. FleetPride is your First Click in Heavy Duty®.