Modline Rainwater Tank Dimensions: 1150mm x 3500mm x 2020mm (ML-1150-3500-2020). Your Kingspan 7,850 Litre Modline Aquaplate (Colorbond) Steel Water Tank with modern flat ends is great looking solution for large suburban homes, irrigating gardens and vegetables, and plumbing into toilets, laundry, baths and showers. 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.