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The Union can be ued for cementing trucks,all kinds of manifolds and other high pressure equipment, and pipes .It is an important part for transporting oil.Water,fracturing fluid and mixed fluid.These products are all made of high quality sted by forging and finishing cut.They have good.mechanical performance and sealing property.Especially they can operate and sealing property.Especially they can operate under the bad weather condition.They can be assembled fixed easily and conveniently. Main technical parameter model number collecting norm working pressure, structural length drift diameter.