Pump Vaults are built to be extremely strong to protect your pumps and plumbing for your underground water storage systems. These are big enough to fit pumps, ionizers, check valves and auto fill valves. The covers provide easy access to the pumps, plumbing and accessories housed inside. Pump vault extensions are also available and easy to install if you need to increase the height of the Vault in those deeper, larger basins. Each pump vault extension allows for another layer of Eco-Blox!