Left over from a job, 2 x 450mm drain chamber risers, outside diameter is about 500mm and total height of the pair together is about 430mm, they are complete with the rubber seals to make watertight joins. This is them;
https://www.drainageshop.co.uk/polydrain-inspection-chamber/450mm-diameter-...

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2 450mm drain chamber risers (Wirksworth DE4)