The EcoPlus Eco Air Adjustable Air Pump is an excellent pump for oxygenating freshwater and saltwater aquariums or hydroponic systems. Connecting this pump to an air stone (or stones with the use of an air manifold) will help you keep your water well-oxygenated, keeping plants happy and healthy. Oxygenating your water helps your plants absorb more nutrients while simultaneously strengthening their roots and preventing root rot. This basic pump is great for decorative aerating ornaments, and meets the requirements of air dividers and manifolds from four to twenty-two outlets. Eco Air pumps are oil-free and have their cylinders and pistons made with premium materials, making the pumps strong and very durable. 5.7″ x 3″ x 4.5