Aquascape Pondless Waterfall Vault, for Use with AquaBlox Modular Water Storage System, Expandable, Large Interior, Black | 49000 Excellent water circulation through horizontal and vertical water intakes Integrates with Aquascape AquaBlox for easy installation; ideal for use in Pondless Waterfalls and RainXchange projects Made from durable rotationally molded polyethylene; easily disguised lid and inspection port Large interior fits a wide range of pump sizes up to 12,500 gallons per hour Measures 23 x 17 x 25.5 inches (LxWxH); 16 x 16-inch access opening; limited lifetime warranty