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|-
 
| [[Pipes|Perforated pipe]] and surrounding [[Aggregates|aggregate]]
 
| [[Pipes|Perforated pipe]] and surrounding [[Aggregates|aggregate]]
| 200 mm (i.e. pipe diameter)
+
| 200 mm diameter pipe
 
| Not applicable
 
| Not applicable
 
| 0.4
 
| 0.4

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