PENN PLAX 3-Inch Bubble Disk Air Pump Accessories Small

"With the Deluxe Bubble Disk you can create a beautiful tower of bubbles that will add to your decor while helping to aerate your aquarium. Made of a durable porous plastic each Bubble Disk can be connected to your air pump and tubing (not included) using the standard 3/16"" tubing connection to provide an endless stream of bubbles. The Deluxe Bubble Disk can be set at any angle in your tank and can be buried without fear of clogging. Available in four different sizes including 3"" 4"" and 5"" diameters or a 3-1/4"" seashell design that will add look perfect in your underwater environment."