Modline Rainwater Tank Dimensions: 1150mm x 2300mm x 1560mm (ML-1150-2300-1560). Your Kingspan 3,900 Litre Modline Aquaplate (Colorbond) Steel Water Tank has modern flat ends and makes a good solution for outdoor gardens, pool top-ups and be plumbed into toilets and laundry. AQUAPLATE is a BlueScope steel specifically designed for use in rainwater tanks and storing drinking water. The corrugated steel tank has an inner poly layer fabricated to a galvanised steel substrate, while the outer layer consists of a COLORBOND laminate coating.