tender for supply and delivery at site isi mark socket and spigot jointing system centrifugally cast di k 9 pipes conforming to is 8329-2000 (third revision) in standard length 4 m, 5 m, 5.50 m, 6 m for push-on joint (rubber gasket) with internal cement mortar lining and external protection by metallic zinc coating with finish layer of synthetic resin/ bituminous coating of outside as per is: 8329-2000 specification with necessary jointing material rubber gasket (is: 5382:1985) including transportation, loading unloading and stacking at site including free supply of polyethylene sleeves for water supply projects at damra to mohishila & barachak scheme within asansol municipal corporation.