Modline Rainwater Tank Dimensions: 1100mm x 2100mm x 2020mm (ML-1100-2100-2020). Kingspan's 4400 Litre "Tall" Modline AQUAPLATE Steel Water Tank with modern flat ends services 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.