2 in 1 multi-function cleaner: The gravel cleaner is ideal for water changes and sand cleaning. The large diameter suction pump features an built-in round hole filter to help prevent the suction of small fish and gravel. It effectively removes waste and leftover food from the tank, separating debris to help maintain water freshness. High quality material: This aquarium water changer is made from durable high-quality plastic for long-term use. The soft and transparent PVC hose allows for faster fluid transfer. All components are separate, allowing for easy disassembly, cleaning, and reassembly. The design is simple, lightweight, and easy to carry. Easy to use: The siphon pump is ergonomically designed for comfortable handling. Simply squeeze the pump several times to start the flow of water automatically. High quality PVC tubing resists collapsing, helping to maintain consistent water flow. (Note: The water outlet must be positioned lower than the water inlet.) Control valve design: The adjustable control valve allows you to regulate water flow according to your needs, providing better control during cleaning. Multi-function: Featuring a self-priming water diversion design, this compact and practical tool can be used not only for aquarium maintenance but also for siphoning liquids such as diesel from vehicle tanks.