... JIS Certificate:ISO9001-2000 best price for you cap seamless fittings:1/2"-24"(DN15-DN600) welded fittings ... :6"-48"(DN150-DN1200) MaterialCarbon SteelTechnicsForgedTypeCapPlace of OriginHebei, China ( ... WPB,WP11,WP22,WP91,304,304L,316,316L,etc.6)Useas a pipe joint widely used in oil, chemical ... than 20 years production history ASTM carbon steel cap