supply of pvc materials for maintaining of different m i schemes under bethuadahari ( a-i ) sub-division within the jurisdiction of krishnagar-i ( a-i ) division.--1 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) 2 supply of 200 mm dia u. p.v.c.pipe 3 supply of 200 mm dia u. p.v.c.flanged tail piece with metalic flange(class-ii) is:10124(part-6)/1988 certification marked with latest amendments (ftp including 200 mm dia ms flange with 8 nos hole (12mm thick)