Penn Plax® Action Air® Aquarium Ornaments bring animation and charm to your underwater world while aerating your tank. This Action Air® Half-Shipwreck Bow Live-Action Aerating Aquarium Ornament gives your aquarium a sunken treasure look and feel. Each ornament is created in great detail and weighted to help them stay put. Simply connect the ornament to your air pump (not included) and watch as the entire half-ship slowly rock as if caught in the ocean currents while a steady stream of bubbles rise from holes in the ship providing your tank with much needed air. The ship"s mast also sways for added action and can be left to look broken or extended to the upright position. Use your pressure control valve (not included) to adjust the motion and the volume of air. 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. Ship bow measures approximately 5-1/2"x 3"x 7" high when the mast is fully raised.