Aquascape's Pondless® Waterfall Pump Vault is perfectly sized and priced for small to mid-sized projects. It features excellent water circulation, a wide opening and large interior space to accommodate a wide range of pump sizes. This vault includes a water level inspection port and is designed to integrate with the Small AquaBlox®. For larger projects add a Pondless Vault extension and integrate with Large AquaBlox®. 18"W x 23"D x 25.5"H