Section 123 in West Bengal Municipal (Building) Rules, 2007
123. Sinks.
(1) A sink shall be so located that as least one of its sides will be against an external wall or in a window recess or in a position to ensure suitable connection.(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.(3)(a)A pipe shall be joined to the sink by a bell mouth at the bottom of the sink having its internal diameter about one inch larger at the sink than at the other ends;(b)the sink outlet shall be fitted with a brass grating and a plug;(c)the sink waste pipe shall have an internal diameter of not less than 5 cm (2 inch) and shall be preferably provided with a trap of drawn lead or other equally suitable material fitted with a brass cleaning screw at the bend.
