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GP pipes are galvanized pipes that are made of thin sheets of carbon steel electroplated with zinc and then rolled into pipes. They are superior to GI pipes in terms of finish. GP stands for "galvanized pipe". On the other hand, GI pipes are galvanized iron pipes or coated iron pipes in old terminology. They are immersed in a galvanic (zinc) bath to prevent corrosion and rust. According to IS 1239, each pipe shall bear a color strip across the circumference for identifying the "class" of the GI pipes. These pipes are cheaper, lightweight, and easy to handle

GI = Galvanized coated iron GP - thin sheets of carbon steel are electroplated with zinc & then rolled into pipes.