supply of spare parts for b- check maintenance and replacement of batteries of 02 no . -750 kva dg sets installed at nhpc residential complex , sec-41 , faridabad . , cat ( a ) -items to be supply and installation , kit 3238493 - kit fuel filter and ring , kit 3238204 - element lube oil filter , kit 3879488 - kit super byp filter elem , 3827423- element crn resistor , 4020551- element air cleaner , 4020552- element air cleaner , 3167218-inhibitor corrosion , 10 ltr . , 4912590-strip test , 500255- valvoline premium blue 7600 ( 15w40 ) 1 / 210 ltr , ax 1012845- 12 v 160 ah pulse lite battery , cat ( b ) - buy back items , buy back rebate on old battery