This aquarium water changing tool is convenient, you can clean the aquarium easily and quickly. Ideal for changing water and cleaning gravel. With its flow control valve, it is convenient and easy to use. The aquarium pump is made from good quality plastic material which guarantees long term use. Its flexible transparent PVC hose transfers liquids easily and quickly. The upper part (the integrated filter for gravel and fish) is specially designed for cleaning gravel. You can sink it into the gravel. In an aquarium with a mini reef or aquatic plants, the pump cleans the gravel while performing the regular water change. Its small suction cup makes it easy to clean around and under stones, wood and corals. Its total length is 2.5m, you can add more hose to the tap if needed (extra hose not included). Contains a small liquid transfer container for faster jobs (like siphoning diesel into a vehicle, etc.)