The Aquascape Pondless Waterfall Vault Extension increases the height of the Aquascape Pondless Water Vault for applications with larger pumps or using the AquaBlox Large Water Storage Modules. The extension is designed to slide directly onto the Pondless Waterfall Vault. Its durable, rationally molded, rounded, polythylene shape maximizes the structural strength of the extension. The extension measures 9" long.