(1) All pipes, traps and associated fittings shall be free from defects and shall comply with the requirements of this section.

(2) All drain-pipes, sewer-pipes, soil-pipes, bends, junctions and associated fittings shall be of glazed earthenware, asbestos cement, U.P.V.C., concrete, pitch-impregnated fibre, cast iron or other approved material.

(3) All waste-pipes and vent-pies shall be of cast iron, galvanized steel, drawn lead, copper, brass, asbestos-cement, U.P.V.C. or other approved material.

(4) Where U.P.V.C. pipes are used in any building exceeding two storeys, such pipes shall not be exposed to direct sunlight.

(5) All pipes, traps and associated fittings shall be of the same material in any one sewerage system or plumbing system, and specifically designed for the purpose of their use:

Provided that a change from one material to another may be made with fittings made specifically for that purpose.

(6) All traps shall be of glazed earthenware, porcelain, vitreous china, lead, brass, copper, cast iron, galvanized mild steel or stainless alloy or other approved material, or shall be porcelain-enamelled inside.

(7) All traps shall have smooth interior water-ways of full sized bore and except in the case of resealing traps, their nominal inside diameter shall be not less than the outlet diameter of the sanitary fittings or the sewer pipes to which they are connected.