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Claim 1

A COUPLING UNIT FOR USE WITH TUBULAR CONDUIT OR THE LIKE COMPRISING A COUPLING BODY HAVING A PARTIALLY THREADED CYLINDRICAL EXTERIOR, A CENTRAL BORE AND A LARGER DIAMETER COUNTERBORE CONCENTRIC THEREWITH AND JOINED THERETO BY A RADIALLY EXTENDING ANNULAR WALL AT ONE END OF SAID BODY; A RESILIENT, COMPRESSIBLE SEAL MEMBER DISPOSED WITHIN AND FILLING SAID COUNTERBORE, SAID SEAL HAVING A RELAXED CROSS SECTIONAL VOLUME GREATER THAN THE CROSS SECTIONAL VOLUME DEFINED BY SAID WALL AND SAID COUNTERBORE; AN APERTURED CAP IN THREADED ENGAGEMENT WITH THE COUPLING BODY; AN APERTURED RING HAIVNG A CENTRAL FRUSTO-CONICAL SURFACE HOUSED WITHIN SAID CAP; A CYLINDRICAL THRUST MEMBER ALSO HOUSED WITHIN SAID CAP, SAID THRUST MEMBER HAVING ONE END IN ENGAGEMENT WITH SAID SEALING MEMBER AND ONE END IN ENGAGEMENT WITH SAID RING, SAID RING AND THAT END OF THE THRUST MEMBER IN ENGAGEMENT THEREWITH INCLUDING OUTER, ANNULAR, PLANE SURFACES IN CONCENTRIC RELATION, SAID THRUST MEMBER FURTHER INCLUDING, AT THE END IN ENGAGEMENT WITH SAID RING, A FRUSTO-CONICAL SURFACE TO ACCOMMODATE THE CENTRAL FRUSTO-CONICAL SURFACE OF SAID RING, THE POSITION OF THE LATTER SURFACE BEING DISPLACED FROM THE POSITION OF THE FORMER SURFACE WHEREBY THE CENTRAL SURFACE, OF SAID RING IS SPACED FROM THE CENTRAL SURFACE OF SAID SPACER TO PERMIT FLEXTURE OF THE FRUSTO-CONICAL SURFACE OF SAID RING INWARDLY TOWARD THE COUPLING BODY, THE FRUSTO-CONICAL SURFACE OF THE RING BEING FLEXIBLY YIELDABLE AND TERMINATING IN A CIRCULAR GRIPPING EDGE HAVING A DIAMETER CLOSELY APPROXIMATING THE DIAMETER OF THE OUTER SURFACE OF THE CONDUIT TO BE COUPLED TO FACILITATE INSERTION OF THE END OF A CONDUIT OR THE LIKE INTO SAID COUPLING BODY THROUGH SAID CAP, SAID RING AND SAID CYLINDRICAL SPACER BY FLEXURE OF SAID FRUSTO-CONICAL SURFACE AND TO PREVENT REMOVAL OF SAID CONDUIT BY PENETRATING CONTACT OF THE GRIPPING EDGE OF SAID RING WITH THE EXTERIOR OF SAID CONDUIT, SAID CAP INCLUDING AN ANNULAR WALL SURROUNDING THE APERTURE THEREIN AND ENGAGING THE FLAT ANNULAR PERIPHERY OF SAID RING, SAID THRUST MEMBER AND SAID SEAL IN ASSEMBLED CONCENTRIC RELATION WITH RESPECT TO THE COUPLING BODY WHEREBY AS SAID CAP IS ROTATED ON SAID COUPLING BODY AXIAL MOVEMENT THEREOF IS TRANSMITTED THROUGH SAID RING AND SAID SPACER TO COMPRESS SAID SEAL MEMBER AGAINST THE OUTER SURFACE OF THE CONDUIT.