Efficient stainless steel rainwater filter integrated in a concrete extension piece. The XL filter is installed in line with the inlet and overflow, in the manhole above the rainwater tank. Rainwater enters via the inlet and passes through the stainless steel mesh of the filter into the tank. Debris retained in the filter is flushed away during heavy rainfall or when the rainwater tank overflows. Thanks to its large filter surface area, this filter is also suitable for large roof areas such as schools, residential care facilities, industrial buildings, etc. Note: the manhole and openings are not pre-drilled, and sealing rings are not included.