Innovative aquarium water changer and gravel cleanerBuilt-in check valve prevents back siphon of aquarium waterFlow valve allows precision control during aquarium maintenanceInnovative aquarium water changer with convenient features. Now it's easier than ever to clean your gravel and siphon out dirty aquarium water. The Gravel Cleaner features a check valve for unidirectional movement of water to control spills and back siphon. Also features shut-off/flow control knob and internal screen to catch aquarium debris.SizeDimensionsHose lengthSiphon diameterMedium20" x 1-1/2"5-1/2 ft1-1/2"Large22" x 2"6 ft2"Please click on "More Information" for directions for use.

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