Taam RIO pumps are fully submersible. The ceramic shaft and high-impact plastic make the pump reliable and long lasting. Magnetic rotor technology offers low maintenance and high reliability. Because it does not use oil, it cannot contaminate your aquarium environment. The RIO delivers a high flow rate with a tremendous pressure capability and is quiet to operate. RIO pumps come in a wide variety of sizes - you are sure to find one that suits your circulation needs.