Can be directly butted with API NC;

Compared with API NC buckle, the torsion resistance (30%--50%) was significantly improved.

With the same torsional behavior of API NC buckle compared to nozzle increases, pressure drop;

No water level, smooth transition, not easy to erosion;

Before relegation, there is a greater outer diameter allowable wear value compared with the API NC buckle.

Improve the fatigue resistance of the joint.