... Thread with Coupling or cap End protector 1)Plastic pipe cap;2)Iron protector SurfaceBared, Galvanized, Black Oiled,Or Other Anti ... mainsDeep tube wells casing pipes, Gas/Natural gas pipe lines, Oil pipe lines, LPG & other non-toxic gas pipelinesIndustrial Purposes ... in the production and selling of square, round, rectangular pipe surfaced with galvanized coating, polish, black painting and oiled ...