The concrete special cover slab is specially designed for manhole or segmental construction, manufacturing precast concrete chamber rings up to 3000mm that comply with BS EN 1917:2002 and BS 5911-3:2002.
There are also 3660mm and 4000mm diameter which is not covered by the British Standard but complies with all the relevant provisions of the British Standard and Eurocodes.
Visit the Marshalls CPM website for more information on Quality Concrete Special Cover Slabs.