Nominal Tank Capacity 1590 Litres (350 Gallons) Dimensions (LxWxH) 1674x1293x994mm 66x51x39 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.