In the pavement outside our house is a 200mm square concrete "plug" or panel in a pavement slab, probably about 50mm thick. Plug is a courser mix concrete than pavement. It isnt mortared in and I could probably lift it out if necessary. What is it likely to cover ? Old Water stoptap ? I would like it to be access to the "drain" which exits our Victorian terraced house 10m away , taking both surface and foul water, and connects presumably to the main sewer in the road but which has no manholes anywhere. Photo:
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