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 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 Convenience: Roof vent kits help save time and effort. 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: Roof turbine vent adapter made of high-quality steel with a powder-coated, rust-resistant finish to withstand harsh weather conditions. Heavy-duty construction ensures long-lasting durability.