Aggregates; Aggregates for use in the preparation of concrete; Angle irons, not of metal; Roof flashing, not of metal; Roofing tiles, not of metal; Architraves of non-metallic materials; Lintels, not of metal; Slate; Roofing slates; Woven mats (Non-metallic -) for the protection of banks against erosion; Woven mats (Non-metallic -) for the protection of dikes against erosion; Woven mats (Non-metallic -) for the protection of slopes against erosion; Reinforcing materials, not of metal, for building; Road asphalt; Ceramic articles for construction purposes; Rainwater drainage apparatus of plastics materials; Floor drainage channels made of non-metallic materials; Trench drains [concrete drainage structures]; Channels of non-metallic materials for transmitting air for ventilation; Sluices [drains] not of metal; Ducts (installations of -) [non-metallic, non-electric]; Fire resistant collars (Non-metallic -) for pipes; Water-pipes, not of metal; Air ducts of non-metallic materials for buildings; Venting ducts (Non-metallic -); Penstock pipes, not of metal; Ducts made of plastics for trunking pipes for gases; Non-metallic conduits for water distribution; Non-metallic conduits for water discharge; Non-metallic air ducts for buildings; Non-metallic pipes for roof drainage installations; Ducts, not of metal, for ventilating and air-conditioning installations; Sewer pipes (Non-metallic -); Manhole covers, not of metal; Shaft covers, not of metal; Drainage courses (Non-metallic -); Drains [other than of metal or plastic]; Rain traps, not of metal; Drain gullies, not of metal; Ducting conduit installations (Non-electric -) of non-metallic materials; Pipes and tubes, and fittings therefor, including valves; Railway materials.;
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