Air pipe gasket. A component which provides a sealing surface at the Air Injection System Line. A gasket which provides a sealing surface at the vacuum check valve. Gasket for Air Injection System. Secondary Air Injection Check Valve Gasket. Secondary Air Injection Control Valve Gasket. Control. Pipe. Pump Hose. SECD INJN CHEEK. Shut - off. Vacuum Check. Included with: Inlet pipe.