The Flexoline Varitanks from GEP are concrete rainwater citerns for rainwater. The perfect rainwater citern to use for rainwater. The Flexoline Varitank is the ideal solution for placing a concrete pit in no time. The prefab concrete rainwater citern utilizes a collapsed PE ring on which an extensive range of PE constructions, with or without Trident rainwater filter, can be installed very easily. The types 150/325 and 450 are ideal for rainwater citerns for residential construction. The Varitank rainwater citerns are characterized by a fast installation thanks to the patented rotatable, shortenable, telescopic shaft construction. The extensive range of covers fits on these Varitank shafts of the rainwater citerns, making the rainwater citern safe, traffic-safe or "invisible". Thanks to the filter tray, the 325 version is the most child-resistant rainwater drain on the market! You can also create a design of a rainwater system online via the online GEP rainwater calculation module.