Features: stainless steel cap. Size:1/2"-48"(DN15-DN600 ... , ASTM, MSS ,JIS , DIN , EN,MaterialCarbon steel :ASTM A234 WPB ANSI B16.9ConnectionButt-weldingApplications rangsuch as oil ... , chemical industry, water conservancy, electric power, boiler, machinery, metallurgy, sanitary construction etc.QualityISO9001 : ... and developing our career by credit standing" stainless steel cap