1. Best Ventilation Solution: Designed to fit 8' whirlybird turbine roof vent, round chimney cap, and roof vent cap, our roof vent adapter enhances ventilation in shipping containers or container storage, reducing moisture and heat while protecting stored cargo. 2. Precision Fit for Conex Roof: This container accessory is designed for Conex container roofs with 3.5' rib spacing, helping prevent leaks and allowing retrofitting of the ventilation system for container houses. Before purchasing, please measure your roof rib size. 3. Roof Vent Kit Saves Time and Money: Includes positioning aid sticker, driver bit, drill bit, and other installation components. The corrugated base design allows secure attachment to the Conex box roof without welding. 4. Excellent Weather Resistance: The roof turbine vent adapter is made of high-quality steel with a powder-coated, rust-resistant finish, built to withstand harsh weather conditions with heavy-duty durability.