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Side caps for drainage tunnel (2 pcs per set). The tunnel from a German manufacturer is specially designed for constructing an underground drainage field and serves to divert treated wastewater as well as stormwater. For passenger car access, the minimum soil cover layer must be at least 500 mm. If the area above the drainage is pedestrian, the soil layer can be min. 250 mm. The advantage of these tunnels is that they can be stacked on top of each other during transport and storage, significantly reducing transport costs. Drainage tunnels are installed in one or several rows. Depending on the degree of soil water saturation, they can either drain or accumulate water. The advantage of drainage tunnels is natural water filtration through the soil, which is especially important near large industrial enterprises. Infiltration tunnels ideally combine with septic tanks from any manufacturer, completing wastewater treatment effectively.