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The PASS Coupling adopts flat-mouth type design and it
meets the requirement on passing with the gap between the
coupling key shoulder and the pipeline.

Under the prerequisite of guaranteed strength, the coupling
with this type of structure is not necessary to complete
clamp the pipeline and partial axial and radical shift are
allowable.

This coupling is suitable for flexibility-required
pipelines. In the coupling structure the deviation of
outside diameter of pipeline and elimination of the
disadvantageous factors resulted from the said deviation
are considered.

The pass design can completely adapt the pipeline deviation
and the coupling performances are not impacted.