Prefabricated aerator carry out with white flexible polyolefin FPO/TPO, fitted with a smooth flange to improve welding to the roofing membranes MAPEPLAN® T in FPO/TPO and a polypropylene TOP cap. Made by molding, compatible with MAPEPLAN® T in FPO/TPO synthetic waterproofing membranes. Realized with FPO/TPO and polypropylene resistant to weathering and U.V. rays. With upper removable polypropylene TOP cap. Aerator with 200 mm height, 75 mm internal diameter. TOP cap with 80 mm height and 110 mm external diameter.