Relates to a 110mm diameter PVC-u surface water drainage pipe, with 110mm and 160mm diameter polypropylene couplings, for the conveyance of surface water. Key factors assessed were strength, performance of joints, flow characteristics, resistance to chemicals and durability.
Date of the second issue: 4th August 2017. Supersedes the first issue, dated 7th October 2013. Originally certificated on 11th August 1987.
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