The Elring Secondary Air Injection Check Valve Gasket - 504430 is a gasket designed for use in secondary air injection systems. It is made by the company Elring and is part number 504430. This gasket is used to seal the check valve in the secondary air injection system, preventing air from escaping and ensuring proper functioning of the system. It is made of high-quality materials and is designed to fit securely and effectively in the check valve. This gasket is an essential component for maintaining the performance and efficiency of a vehicle's secondary air injection system.