Suisaku Pro-Hose Water Change and Gravel Wash Tool for Fish Tank / Aquarium (tube length 44 cm, hose length 164cm , best for large size - 45cm around height fish tank) Changes water and removes debris from the gravel simultaneously Siphon water easily and fast with built-in bulb Filter in the tube to prevent sucking in small fishes or blocking the tube with debris Adjustable water flow to control siphon speed and discharge dirt along with water Connect to an extension tube easily for big or deep tank / aquarium