supply of pvc materials for maintenance of different running m.i. scheme at tehatta (a-i) sub-division under krishnagar-i(a-i) division. , supply of u.p.v.c. pipes (class-i) is:4985/2000 certification marked with latest amendments, ivory grey coloured, both end plain, along with one matching coupler/socket (class-ii) duly is:10124/1988 certification marked and required solvent cement duly is:14182/1994 certificationmarked for each pipe. length of each straight pipe 6 mts. tolerance +10 mm (nominal wall thickness of pipe 2.5 to 3.0 mm) , 140mm dia .p.v.c. pipes (class-i) is:4985with latest amendments, , supply of 200 mm dia p.v.c.coupler , supply of 140 mm dia p.v.c.coupler