The “TOP” DRAIN with mechanical fixing is one of the best systems for connection to rain pipes, the measurements correspond to the UNI EN 1451-1 standard, the coupling goes on pipes with glasses and sealing gaskets (without adhesives). The “Top” vent is particularly suitable for use on roofs with minimal slopes, under roof gardens, “inverted roofs” and tiled terraces. The coupling and fixing with waterproof membranes is done mechanically by means of a screw ring, this system allows use with all types of waterproof membranes.