The 12" Diameter Superior Flashing 6/12 - 12/12 Pitch is a highly suggested product for your direct vent fireplace unit and venting system. This high quality RTL flashing promotes a material that does not easily rust and wear out quickly. It's heavy duty construction promotes durability for years to come, ready to block leaks and wear to the system. Use this flashing to protect your system and keep it ready to help warm family events for years to come