About this item Supreme Aqua-Mag Pumps Air Fractionating Water Pumps are the ideal pump choice for the aquarium hobbyist looking to maximize dissolved oxygen levels in their freshwater or saltwater aquarium. The pumps’ uniquely designed shaft and impeller design breaks up the in-flowing water and creates tiny bubbles that add vital oxygen to the aquarium water. Equipped with a reusable debris pre-filter and a 18″ vinyl aerating tube with noise-suppressing muffler that allows for reliable and quiet use in aquariums of all sizes. The Aqua-Mag Air-Fractionating Water pumps will operate efficiently submerged or in-line and are particularly ideal for saltwater / reef aquariums with their ceramic shaft design and adjustable, front-mounted venturi. Unique ceramic shaft fractionating impeller design Operates submerged or in-line 10′ Power Cord. Models 12: 3/4” FPT Inlet, MPT Outlet and Venturi is Barbed to Accept 1” Flexible Tubing