1. Best Ventilation Solution: Designed to fit 8' whirlybird turbine roof vent, round chimney cap, and roof vent cap, this 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 and helps prevent leaks during ventilation system retrofits for container houses. Please measure your roof rib size before purchase. 3. Roof Vent Kit Convenience: 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: Made from high-quality steel with a powder-coated, rust-resistant finish, this roof turbine vent adapter offers durable performance in harsh weather conditions.