4Pcs Aquarium Bio Sponge Filter with Suction Cups Check Valves for 5 Gal, 10 Gal
Easy top set up & clean: simply install an airline into the unit and turn on the air pump, simply rinse and squeeze sponge in tank water. Size Up to 5 gallon 4 Pcs. It is a great way to clean and oxygenate your fish tanks.