The PrimaTech 15.37mm I.D. Compressor Port Stat Seal is the perfect choice for medium to heavy duty trucks. This seal is designed to provide long reliable service and a high level of reusability. It features a precisely controlled optimum percent squeeze that eliminates over compression and a retainer edge that is visible after installation, allowing for easy visual inspection and reducing failures caused by missing seals. No machined O-ring grooves are required in the mating flange, making installation quick and easy. With its superior design and construction, it is the perfect choice for your truck. FleetPride is your First Click in Heavy Duty®.