Nominal Tank Capacity 460 Litres (100 Gallons) Dimensions (LxWxH) 1040x761x686mm 41x30x27 ins WRAS Approved Product. Tank is complete with a Sealed Lid, Screened Air Inlet Vent and 25mm Insulation on the Lid and Sides. Note : Tanks must be mounted on a flat level platform supporting the whole of the base.