High-quality products, eco-friendly, durableEquipped with adjustable water flow switch knobCan effectively clean the gravel in the water, keep your aquarium cleanSuitable for the fish tank range: Small and medium-sized fish tanka unique hydraulic design, hold the tube shaking up and down, water can be recycled outthe outlet valve design, you can freely control the size of watercan quickly filter impurities in water, wash sand easilynon-toxic environmental protection, high flexibilitycleaning, washing sand, decontamination get Aquarium Fish Tank Gravel CleanerAquarium Gravel/Sand Washer effectively separates and removes debris created from your aquarium gravel while you perform routine water changes. They are constructed with flexible, high quality tubing and a unique gravel tube that will not crack or chip. The strainer of the inlet is to collect the debris while protect fish and sand being carried .Doesn' hurt any aquarium fish when using.Aquarium Gravel Vacuum Siphon adopt the principle that Exclude the out of the tubes to make the water flow out based on height difference/ pressure difference.colour: Transparent colorMaterial: PVCsize: Tube length: 488cmHose length: 1493cmPackage Contents: 1*Aquarium Fish Tank Gravel Cleaner1*Chinese and English manualIMPORTANT NOTE: Must shake it up and down to exclude to have water flow, otherwise water cannot flow out.Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.