supply and delivery of gi top cover,c.i tail piece,m.s heavy duty hose clamp and brown paper of water pump for maintenance of diff. state owned major rli schemes under malda-i (a-m)sub-division within malda-i(a-m) division under non-plan maintrnance. , supply and delivery , gi top cover plate of 150mm dia alfa-alfa valve (c-type) 273.1 mm dia,10mm thick and pcd 257mm with hub internal dia 20 mm and outer dia 45 mm, 8 nos holes each 45 degree apart fitted for 150 mm nominal bore alfa-alfa valve , 150mm dia c.i tail piece, one ends flanged (23 mm flange thickness), drilled as per is:6392(table-17) and other end grooved, overall length (175+/- 15)mm with 7nos grooves material shall be cast iron conforming to grade fg 200 of is 210. one coat of black japan (type-b) conforming to 341/1973. casing shall have < 12.5 micron surface. , m.s heavy duty hose clamp 150mm nominal dia 2mm thick, 45mm width fitted with 10mm dia, 100mm long ms nut & bolt with full threaded with 2 no washer. parent material(tata/gkwmake) conforming grade-b of is:2062/1999 with one cote of black japan , brown paper of water pump