... pressure core union, tee, high pressure hose, elbow, pressure gauge, and pup joint etc. Surface valve-group adopts gooseneck tee ... manifoldUsed to control fluid pressure and flow-rate, rigid manifold is jointed with control head upwards and connected with ... manifoldUsed to joint the control head, rigid manifold and blowout pipeline, the manifold consists of special EUE seamless steel pipeline union ...