The entire tank is reinforced with sturdy vertical ribs, and the rounded bottoms are additionally strengthened with a horizontal rib. Each wall of the tank has two carrying handles, and the lower part has slots to insert the forks of a forklift truck.
Two round inspection hatches with extension rings and covers are located on the top of the tank. Mounting the cover to the tank with 4 mounting screws prevents direct access to the tank. A 110 mm diameter seal-mounted PVC supply pipe is fixed to the smaller 400 mm diameter inlet extension ring of the manhole. Under the extension ring there is also a 290 mm diameter hole with a filter screen. The larger of the manholes is 600 mm in diameter. There is a flat surface in the outlet section of the tank where the drain is installed. It consists of a 110 mm diameter PVC pipe and a siphon mounted to it consisting of three 110 mm PVC elbows and a pipe. The tank may only be installed in pedestrian areas.