AquaBlok® Rainwater Drainage System is made for draining extra rainwater that flows from roofs. This system can be used as a component of a full rainwater management system as well as a solo drainage system. It is made of polyethylene with 54 cm walls giving it a 150 liters capacity and a weight of 8 kg. This heavy duty system is thrust-resistant and can handle upright loads up to 2.5 ton/m2.