... Beveled3) Thread with Coupling or cap End protector 1)Plastic pipe cap;2)Iron protector SurfaceBared, Galvanized, Black Oiled ... have always adhered to the business policy as "Quality for Survival, Product for Development, Credibility for Cooperation ... steel pipe manufacturing group. We have cooperated with Bao steel, Wu yang steel, TPCO, Baotou steel, Shou gang Jin tang Steel, An gang Steel, Daye Steel ...