Enhance the flow of water in your aquarium with these Eheim Reducers 9/12 - 12/16 Ref 4003980. The lot of 2 pieces are new and have not been used, though they do not come with packaging. The reducers have a diameter of 12/0 5/8in, 9/12 mm and are suitable for whole water. Perfect for aquarium enthusiasts looking to optimize their tanks without compromising the health of their fish. Get your Eheim Reducers now! Comes in lot of 2 pieces.