VEVOR Aquarium Vacuum Gravel Cleaner, 50 ft PVC Hose Fish Tank Vacuum Gravel Cleaner, Siphon Fish Tank Cleaner Vacuum, 3 Types of Brass Adapters, for Fish Tank Cleaning Gravel & SandProduct Features Quick & Efficient Water Changes Our aquarium gravel cleaner utilizes the flow rate valve's connection to the gravel pipe and outlet pipe, allowing water to be pumped out using the vacuum pressure generated by water flow. Dirty water flows directly into the sink or bucket, without the need for electricity or multiple manual pumps. Unlike traditional water changers, it only requires closing the water flow valve to add water, suitable