... :ASTM DIN JIS Certificate:ISO9001-2000 best price for you cap seamless fittings:1/2"-24"(DN15-DN600) welded fittings:6 ... ,WP11,WP22,WP91,304,304L,316,316L,etc.6)Useas a pipe joint widely used in oil, chemical industry, electric power ... /C13) HistoryMore than 20 years production history ASTM carbon steel cap