uxcell Plastic Aquarium Fish Tank Gravel Cleaner Siphon Pump Vacuum Hose Pipe 170cm Long Mateial : Plastic;Total Size(L*D) : 170 x 5cm /67"(5.6Ft)x 2"(L*Max.W); Vacuum Cup Size : 9 x 4.5cm / 3.5" x 1.8"(L*D);Color : Blue, White Patented unique pum filter allows dirt in sand to be discharged a long with water. Takes the waste out too while replacing the water; Does not hurt any quarium fish when using. The Siphon cleaner pump makes partial water changes easy and effective with minimum effort. A couple of squeezes on the hand pump is all that is needed to get the pump working.