| 摘要 |
Titled invention improving the restrained surface, Pressed surface of the lock rings and the loop sealed material was comprised of the outer pipe fitting(4), the inner pipe fitting(3), lock ring(6) for outer pipe fitting, a ring groove(7) in the outside of the lock ring, lock ring(8) fitted in the ring groove, a bolt(9) inserted in the outer pipe fitting, a back up ring(12), loop sealed material(15) in the outside of the lock ring and forced wheel(16) fitted in the outer pipe fitting.
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