Aerators for pitched roofs with asphalt shingles are designed to keep the slab dry by encouraging the ventilation of the insulation package. Made of elastic material, they provide a durable watertight seal and excellent resistance to atmospheric and chemical agents. Aerators for pitched roofs with asphalt shingles, with or without a vault cup, keep the slab dry by actively contributing to the ventilation of the entire insulation package. The elastic material with which they are produced ensures long-term watertightness. They have excellent resistance to deterioration caused by the sun, ozone and other atmospheric or chemical agents normally present.