... StyleInner ThreadMaterialCarbon SteelSpecification1″to 4″various Specifications: The high pressure union adopted international technology, produced by hardness alloy steel, ... Choke Valve, Check Valve, Retaining Valve, Shutoff Valve, High Pressure Active Elbow, Well Head Equipment and so on.They ... .minisite.productShow(); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); The high pressure union