Superior 48-Inch Rigid Stove Pipe for SecureVent SystemThe Superior 48 Inch Rigid Stove Pipe for the 4. 5x7. 5 Inch SecureVent Direct Vent System is a premium accessory for gas fireplace installations. Built with a heavy duty aluminized inner liner and a galvanized steel outer shell, this 48 inch section offers exceptional durability. It provides a safe and efficient path for exhausting flue gases, ensuring your direct vent fireplace operates reliably while meeting necessary clearance and safety