The Recharger 330XL storm water chamber features a storage capacity of nearly 475 gal, with approximately 80 cu ft of storage per unit when surrounded with stone. Chambers are equipped with two side portals that allow manifolding at any point within the system, eliminating the need for external manifolds and offering greater flow than available from 18-in.-diameter pipe. The 330XL also features built-in end walls and patented overlapping rib connections.