1. Best Ventilation Solution: Designed to fit 8' whirlybird turbine roof vents, round chimney caps, and roof vent caps, our roof vent adapter enhances ventilation in shipping containers or container storage, reducing moisture and heat to help protect stored cargo. 2. Precision Fit for Conex Roof: This container accessory is designed for Conex container roofs with 3.5' rib spacing to help prevent leaks and is ideal for retrofitting the ventilation system of a container house. Before purchasing, please measure the size of your roof rib. 3. Roof Vent Kit: Saves time and effort during installation. Includes positioning aid sticker, driver bit, and drill bit. 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 to withstand harsh weather conditions. Heavy-duty construction ensures long-lasting durability.