Modline Rainwater Tank Dimensions: 750mm x 1600mm x 2020mm (ML-0750-1600-2020). Kingspan's 2250 Litre "Tall" Modline AQUAPLATE Steel Water Tank with modern flat ends can store water for outdoor use, pool top-ups and use in 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.