... Spec 6A, the product adopts some end connections of pipeline thread, tubing thread, butt-weld and ... compress-seal. The type mainly consists of: 100#, 200#, 206#, 207#,211#, 400#, 600#, 602#, ... mixed fluid . These products are all made of high quality steel by forging and finishing cut ... diameter. the product adopts some end connections of pipeline thread, tubing thread, butt-weld. high ...