Product SPEL Megavault The SPEL Megavault, now known as Atlan Megavault is our modular precast OSD solution for medium to large stormwater detention scenarios.Formerly part of our SPEL Stormwater product range, now available at atlan.com.au. Find Out More Applications This system allows for maximised use of available land by allowing the detention to be located underneath development sites, carparks, roads or parklands.Residential, commercial and industrial developmentsRetail sitesSubdivisionsUrban infrastructure VIEW DETAILS AT ATLAN.COM.AU REQUEST A QUOTE