The works shall have to be executed by the house owner through a licensed plumber or registered contractor of the Public Health Engineering Dept with the written approval of the concerned Executive Engineer, officer-in-charge. Cost of the materials viz.  Pipes, fittings, masonry etc. and labour shall be borne by the house owner. The size of the ferrule shall be fixed by the Executive Engineer/ officer - in-charge on the basis of number of fixtures in a building and cost thereof will be borne by the consumer.