rehabilitation of existing deteriorated / damaged master sewer line with ( cured-in- place pipe ) cipp technology for size 450mm, 600mm, 700mm and 800mm i / d along dividing road of sector - 21 / 22, 22 / 23 and 23 / 23a, gurugram ( balance work ) . “desilting of existing master sewer line including plugging and diversion of flow, providing and installing of cured –in – place pipe liner ( cipp ) of existing deteriorated master sewer line for size 450mm, 600mm and 700mm dia along dividing road of sector - 21 / 22, 22 / 23 and 23 / 23a, gurugram and all other works contingent thereto”. ( including 5 years defect liability period free of cost ) .