Nominal Tank Capacity 320 Litres (70 Gallons) Dimensions (LxWxH) 1599x532x457mm 63x21x18 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.