Genuine Capristo replacement valve control solenoid for Capristo valved exhaust systems. For replacement of an original Capristo-supplied valve control solenoid. These will very infrequently fail after long-term use given their close proximity to the engine and exhaust systems. Sold individually. The valve control solenoid is the electro-pneumatic actuator that controls the vacuum signal to the exhaust butterfly valves, enabling the CES3 or EVCU1 control module to open and close the valves on demand. In the event of solenoid failure, the exhaust valves may default to a fixed open or closed position. Replacing the solenoid with a genuine Capristo unit fully restores programmable valve functionality. Compatible with the vast majority of Capristo exhaust systems equipped with vacuum-actuated butterfly valves. If you are unsure of compatibility, please contact us before ordering.