Section 7(e) in The Chennai Metropolitan Water Supply and Sewerage Board's Sewerage Regulations, 1988
(e)Pipes and Fittings: All pipes, fittings arid fixtures shall be of lead, Galvanized iron, Cast Iron, Poly Vinyl Chloride, High Density Polyethyene, Salt glazed Stoneware, Asbestos, cement, glazed sanitary ware as may be approved by the authorised authority. All pipes, fittings and fixtures shall comply with the requirements of the relevant Indian Standard Specification or such other specifications as may be prescribed by the authorised authority.
