Diverter Valve Kit for OPEL 1.6T - Corsa OPC / Astra OPC / ZafiraOur Pressure Relief Piston valve is a bolt on valve that replaces the factory plastic Diverter Valve which often, fails. The Valve works perfectly without any check engine light in the dashboard, solenoid driven operation guaranties ECU communication. The Piston type valve is engineered to remedy the issues experienced with the factory valves when their diaphragm rapture or when their piston breaks, resulting in boost leaks and premature wear of the