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, helping prevent leaks and allowing for retrofitting of the ventilation system on container homes. Before purchasing, please measure your roof rib spacing. 3. Roof Vent Kit Convenience: These 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: The roof turbine vent adapter is constructed from high-quality steel with a powder-coated, rust-resistant finish to withstand harsh weather conditions. Heavy-duty design ensures long-lasting durability.