This is a 460mm diameter riser measuring 215mm in depth, made from black polyphenylene. It is designed for use with underground inspection chambers in drainage systems, enabling easy adjustment of chamber height during installation or maintenance.
The riser slots securely onto compatible bases, providing a practical solution where added depth is required to reach surface level. It is suitable for both new drainage runs and refurbishment work on site, supporting straightforward installation in a range of ground conditions.
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