This black cast iron enamelled flue pipe elbow, made in the United Kingdom, has a 4-inch diameter and features a 90-degree bend. It is designed for use in stoves, specifically for connecting flue pipes to create a chimney system. The unique aspect of this elbow is the access hatch, allowing for maintenance and cleaning of the flue. This non-domestic product is a durable and reliable option for enhancing the efficiency and safety of your stove setup. Some enamel chips please look at last photo is used.