supply of different materials for krishnagar-ii ( a-i ) sub-division under krishnagar-i ( a-i ) division under core sector-2022-2023 programme. , supply of rcc pipe , supply of np-2 class 225 mm bore dia. r.c.c. spun pipe of length 1.83 metre thickness 25 mm with matching collar as per is: 458 / 1988 with latest amendment thereof including all taxes and transportation cost etc. , supply of5mm thick rubber insertion for raised surface of flange as per is: 6392 / 1971, madefrom white rubber sheet reinforced with 2 ply cotton fabric without holes as per is: 638 / 1979 with latest ammendment if any with isi marked suitable for isi marked ms flange ( table-5, 11, 17 ) i ) 150 mm dia rubber insertion with standard drilled holes ( 5mm thick ) , wedge spindle for ntp valve.