The lily pipe set consists of 2 major parts, the inflow and outflow pipes. It's made from high quality stainless steel material.These pipes are used to increase water movement in lower parts of the aquarium where water can easily become stagnant. The feature of the outflow pipe is to create powerful flowrate for stronger currents without disturbing the aquascape in the aquarium. it's also suitable for Marine aquarium. Hose clips included.