c-40 ( hdpe water storage tanks ( isi marked ) . annual rate contract for the supply of hdpe water storage tanks ( isi marked ) , rotational moulded high polyethylene water storage tanks for storage of water at ground level and as over headtanks and also suitablefor transportation of water or liquid items to remote areas for keeping water hygienic& safe for drinking etc. as per is: 12701 as per detailed specifications with all latest amendments ( double layer ) outer colour , black and inner colour blue tone or white any duly isi marked only as per govt approved design and shall be suitable for wind conditions and sesmic zone v & ambient temperature200 ltrs. , -do- 300 litres , -do- 500 litres , -do- 750 litres , -do- 1000 litres , -do- 1500 litres , -do- 2000 litres , -do- 3000 litres , -do- 5000 litres