... ASME/ANSI B16.9, JISApplicationOil, chemical industry, water conservancy, electric power, boiler, machinery, metallurgy, sanitary construction, etc.Quality First-classAuthentication ISO ... Cap5.ISO Certificate For Carbon Steel Cap6.Why Us? Tianjin YouXinDa International Trading Co., Ltd is a professional pipe cap manufacturer and ... to working with you! Steel Carbon Pipe Cap Manufacturer From Tianjin