Gully tops and manhole tops for vehicular and pedestrian areas. Gully tops and manhole tops made of polypropylene (PP), polyethylene (PE) or unplasticized poly(vinyl chloride) (PVC-U)|Manholes, Slots, Surface-water drainage, Marking, Type testing, Inspection, Concretes, Position, Deflection tests, Grades (quality), Loading, Quality assurance, Cast steels, Roads, Construction systems parts, Cast-iron, Reinforced concrete, Gullies, Quality control, Test specimens, Drainage, Rainwater control systems, Statistical quality control, Design, Dimensions, Certification (approval)