Nominal Tank Capacity 43 Litres (10 Gallons) Dimensions (LxWxH) 532x380x305mm 21x15x12 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.