About this item 2 IN 1 MULTIFUNCTIONAL CLEANER – is for water changing and sand washing. The nozzle net prevents absorbing of juvenile fish, grass and gravel. Attached nozzle can help clean gravels which will effectively separates excrement and food residue from your aquarium, keep the water fresh. COMPACT STRUCTURE – Equipped with 1pcs soft water (72.4in) and 2pcs hard water (11in*2). The ‘s hole is connected tightly with no worries the problem of spilling water. Fitting different-sized fish tank. -BACK FLOW VALVE DESIGN – Widened -reverse makes drainage more effective. Note: Put the QV letter end downward against the bucket when using because the pump is unidirectional. EASY TO USE – Syphon pump is easy to grip, just squeeze the pump a few times, water will start flow automatically. PVC tube won’t collapse to block the water flow, easy to bend it into any position to fit for your use. (Note: The position of water outlet must be lower than the inlet.