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Threaded metric plugs for use in plugging the AIR pipe holes on the exhaust manifold. These are 14mm threads. These are plugs that can be used to plug the threaded holes in the exhaust manifold if removing the AIR injection for smog. Choose from 800-1788 which is an M14-1.5 tapered style pipe plug or the 800-962 which is M14-1.25 thread and a straight thread with sealing washer. The M14-1.5 is what we use the most of but have had customers that say they have M14-1.25 threads (same as the spark plug thread) for the smog holes.
