Section 123(2) in West Bengal Municipal (Building) Rules, 2007
(2)(a)Sinks shall be constructed of glazed stoneware enamelled fire clay or other equally suitable material;(b)they shall be of such shape as will facilitate their maintenance in a state of cleanliness;(c)no wood work shall be used for covering any such sink;(d)the bottom of the sink shall slope towards the outlet.
