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BS EN 274-3:2002
Waste fittings for sanitary appliances. Quality control (British Standard)
This standard specifies the requirements for quality control for waste outlets, traps and overflows for kitchen sinks, shower trays, wash basins, bidets and baths which are connected to gravity drainage systems, whatever the purpose of the building, to ensure conformity of these products with EN 274-1.
British Standards Institution [bsi]