Durable Construction: This 320mm manhole inspection chamber is designed for underground drainage systems with a robust 5-intel base. Versatile Application: Suitable for both residential and commercial properties, providing access for maintenance and inspection. Efficient Drainage: Facilitates smooth water flow and prevents blockages in your drainage system. Easy Installation: Designed for straightforward integration into new or existing drainage networks. Dimensions: Outer diameter of 320mm, ensuring compatibility with standard drainage pipe sizes., Manufacturer: clark Drain