repairing and maintenance of sluice valve under asansol municipal corporation against 07 nos . overhead reservoir and distribution pipe line sluice valve as and when required including supplying of all materials 80 mm to 500 mm dia part a , repairing & maintenance of sluice valve of overhead reservoir , budha zone-i , court zone-ii , dhrupdanga zone-x , hirapur zone-v , kuilapur zone-xxix , shyambandh zone-vii , 225 mm dia boosting line ( part-a ) under asansol municipal corporation . , repaiting & maintenance of sluice valve under asansol municipal corporation against overhead reservoir & distribution pipeline sluice valve as and when required including supplying of all materials ( 80 mm to 500 mm dia ) sluice valve including replacement of spindle , nuts , bolts , gland cap & ll other necessary materials etc . opening of valve & re-fixing the same including opening the valve cover & digging of earth if necessary under budha zone-i , court zone-ii , dhrupdanga zone-x , hirapur zone-v , kuilapur zone-xxix , shyambandh zone-vii , 225 mm dia boosting line ( part-a ) .