Pentair Sta-Rite 145360 Cristal-Flo II Top-Mount High Rated Pool and Spa Sand Filter, 40-GPM, Black Cristal-Flo II top-mount high rated pool and spa sand filter Durable 1-piece extra-thick molded polyethylene tank Internal air relief hole allows air to automatically escape, preventing high pressure buildup 6-Position valve allows to perform all necessary water movement functions; a transparent sight-glass adapter is included Available in black color; measures 20-inch length by 35-inch height by 23-inch width