Modline Rainwater Tank Dimensions: 1150mm x 3300mm x 2020mm (ML-1150-3300-2020). Kingspan's 7400 Litre Modline AQUAPLATE Steel Water Tank with modern flat ends is a larger modline size. Great for larger 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.