A system for reducing pollutants in internal combustion engine emissions, particularly marine electric generator engines, includes a treatment chamber having an intake opening for receiving gaseous emissions from the engine, and an exhaust opening for exiting emissions. The contact-supporting body of the female connector, is made of elastomeric material and the female contacts of the connector are elastically yielding and press-fitted into appropriate seats of the contact-support body. A clamping plate is displaceably attached to the base plate and clamps the conventional tape ruler between itself and the base plate. In the illustrative embodiment, a mounting ring is disposed between the buffer ring and the second section of the housing.