The Penn Plax Action Air Half Shipwreck Aquarium Ornament is an exciting way to aerate your tank. This ornament authentically replicates one half of a sunken ship that lays on the ocean floor waiting to be discovered. Once attached to your air pump (not included), this fish tank rocks back and forth. Steady streams of small bubbles rise from the ship for even more visual appeal while providing the necessary oxygen to the tank. Each ornament is made from a durable plastic resin that is safe for your aquarium. Fun to watch and entertaining for you & your fish, Action Air ornaments fit in almost any tank and come in a variety of styles & sizes so you can continue to add to your aquarium design. About Penn Plax: Penn-Plax is a family-owned company in operation since 1959. They specialize in creating excellent pet supplies for animals both great and small. Best known for producing pet products at affordable prices, the Penn-Plax brand is synonymous with innovation and quality, keeping your pet foremost in mind