South Ocean Five AOF10112 Round Pre-Filter Sponge Roll for Aquarium Filter, 2-3/4 by 6-Inch
South Ocean Five round pre-filter sponge roll is used in overflow boxes. This open cell sponge will give a better water flow, while consistently collecting the sludge from the aquarium. Measures 2-3/4-inch diameter by 6-inch height with 1-inch center hole.