inTank Media Basket for Fluval M40 and 53L Fits Fluval M40 in Chamber One (intake chamber). Keeps rear chambers clean and promotes clear water Forces water through filtration media and not just around it. Media Basket is four sided with one being a removable door for easy and fast filter changes Features a three shelf design with the middle shelf being removable, give you ultimate media options Built in bent acrylic handle for easy install and removal. Improves the poor flow track if you have an early build, water if forced through the basket Makes filtration easy. Room left next to basket to place a heater. Made of high quality USA manufactured Acrylic