Ideal for use in Pondless Waterfalls, the Aquascape Pondless Waterfall Vault provides excellent water circulation through horizontal and vertical intakes, and it integrates with Aquascape AquaBlox -- making installation quick, precise, and simple. Its durable, rotationally-molded, rounded polyethylene shape maximizes structural strength while its large interior fits a wide range of pump sizes up to 12, 500 gallons per hour. The vaults extra-wide opening makes it easy to access the interior of the vault for pump maintenance. The Aquascape Pondless Waterfall Vault also includes a durable lid with a built-in water level inspection port, allowing the vault easily camouflaged and out of sight. The optional Pondless Waterfall Vault Extension can be used when creating deeper basins using the Large AquaBlox, making it perfectly sized to meet the need of any Pondless Waterfall or RainXchange project. It measures 23 x 17 x 25. 5 inches (LxWxH) and has a 16 x 16-inch access opening. The Pondless Waterfall Vault is backed by a limited lifetime . Aquascape is passionate about the products we produce, providing unique products, designs, and features that stand above the competition.