Exhaust Check Valve

The exhaust check valve(s) allows thermactor air to enter the exhaust manifold port drillings (and converter on models with 3-way catalyst), but prevents the reverse flow of exhaust gases in the event of improper operation of system components. The valve is located between bypass valve and exhaust port drillings. Models equipped with a bypass/diverter type valve also have a check valve located between the valve and the catalytic converter.