procurement of refilling of co2 gas in empty co2 extinguisher and co2 procurement of refilling of co2 gas in empty co2 extinguisher and co2gas cartridge of different capacities , gas,chem,carbon dioxide,99.8%,25-35kg , gas,chem,co2,200gm,refill cartridge , gas,chem,carbon dioxide,60gm,is307 , hydraulic stretch testing charges , cylinder cleaning charges , cylinder painting charge , replacement of valve assembly , replacement of valve spindle , replacement of brass glad nut , replacement of brass spindle washer , replacement of brass safety nut , replacement of valve guard , replacement of test ring , replacement of safety brust disc , replacement of cylinder cap => limited