These protein skimmers are designed by Oceanic to fit the 14 and 29 gallon BioCube Aquarium Systems. Skimmer fits directly into the overflow box of the aquarium, and quietly and efficiently removes harmful organics from your marine aquarium. System includes a heavy-duty air pump, air flow valve, skimmer, and airline tubing for easy set-up and operation. System measures 8 1/2” tall.