Modline Rainwater Tank Dimensions: 1150mm x 2700mm x 2020mm (ML-1150-2700-2020). Kingspan's 6000 Litre "Tall" Modline AQUAPLATE Steel Water Tank with modern flat ends is a good size for new homes. Ideal for outdoor use, in gardens, pool top-ups and plumbing 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.