Prepare your semi to be Ready for the Road Ahead with service lines that run smoothly without pressure or power loss, with the Grote Polyurethane Protective Flap Seal. Thanks to its polyurethane composition, this replacement seal is the ideal choice to keep air from escaping and air system contamination. Crafted with a protective flap and durable properties to resist wear from oils, chemicals, and ozone. FleetPride is your First Click in Heavy Duty .