What is the difference between DWI approved and WRAS approved (Water Regulations Advisory Scheme approved) product, and where are they needed?
The primary standards needed for pipework to be installed and conform in the UK is: Drinking Water Inspectorate (DWI approved) which is legal requirement for all distribution and water treatment pipe, including ABS and PVC pipe and fittings and then for systems that are responsible for transporting potable water above the stop cock the system needs to be fully WRAS (Water Regulations Advisory Scheme) approved, again this is needed for all ABS and PVC pipe and fittings.
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