About this item 3 IN 1 Boxtech Aquarium Cleaner: Water changer, washing sand, cleaning, its a multifunctional cleaning tool. Compatible with additional nozzle can help clean gravels which will effectively separates excrement and food residue from your aquarium, keep the water crystal clean. Compact Structure: Compatible with 1pcs soft water pipe(72.4in) and 2pcs hard water pipes(11in*2). It is easy to install and operate. fitting different-sized fish tank. Anti-Back Flow Valve Design – Widened anti-reverse pipe makes drainage more effective. Kindly Note: Please put the QV letter end downward against the bucket when using because the pump is unidirectional. Safe and Easy Use: Made of quality flexible PVC plastic which could ensure a long time use. It won’t collapse to block the water flow, also, it is not too stiff, easy to bend it into any position to fit for your use. Special Design: Extra long tubing & hard pipes allows you to reach any dirty spots