REDUCER - 4 inch to 2 inchStainless Steel Tri Clover Reducer 4 inch to 2 inch. A shorter profile Tri Clover Reducer. This is a 2 and 4 inch tri clover clamp that will fit most standard 4 inch tri clover hardware. Hight 35mm. The tri clover system has been a common connection type in the food processing industry and medical industry as its easy to clean, sanitary and no threads are exposed to the product contained in the fittings.