supply and delivery of different valves, surge tank, bend etc. for maintenance and repair works of different m.i. schemes under lalgola (a-i) sub-division within berhampore-ii(a-i) division under non-plan , supply and delivery of materials , c.i. alfa-alfa valve as per drawing (annexure-e )with ms spindle and weight of the bottom disc to be fitted with rubber washer which will be fitted tightly at the closing of alfa-alfa valve. there should arrangement of squre type key holder made of ms construction ofmplete including two construction ofurse of painting over a construction ofat of priming. approximate weight 20 kg excluding key.(i) 150 mm dia.(type-c) , wedge with m.s. spindle rod for tp/ntp valve with washer( as per sample) , c.i. spout key ( square) for ntp valve ( as per sample) , m.s. surge tank as per drawing (annexure-ii) the body of which made of 3 mm thick m.s. sheet and top & bottom construction of ver are made of 5 mm thick ms sheet welded with the body and strengthened with rib etc. all joints must be electrically welded to a leak proof construction ofndition and joints must be capable of withstanding pressure of 50 psi . the surge tank should be fitted with all accessoriesas specified in the drawing . entire surge tank is to be painted both inside and outside over a construction ofat of priming. , 20 mm x 50 mm nuts and bolts having standard thread ( tata or approved make ) or 16 mm x 75 mm nuts and bolts