Coupling member with a torque resistive-stop

In a coupling member of the type having a generally tubular body portion with a flexible lip as a means for sealing, and a swivel nut attached substantially concentrically to the body portion juxtaposed the flexible lip, the improvement comprising:

• the swivel nut having an open end, and a concave frustoconical surface located at a larger diameter than the flexible lip and a sealing surface portion of the flexible lip generally positioned in alignment with a conic line tangent to the frustoconical surface.

In a coupling member of the type having a generally tubular body portion with a recessed annular element as a means for sealing, and a swivel nut attached substantially concentrically to the body portion juxtaposed the recessed annular element the improvement comprising:

• the swivel nut having a concave frustoconical surface located at a larger diameter than the recessed annular element and the recessed annular element generally positioned in alignment with a conic line tangent to the frustoconical surface such that the conic line intersects the recessed annular element opposite a sealing surface portion of the recessed annular element.

In a coupling member of the type having a generally tubular body portion with a recessed annular element as a means for sealing, and a swivel nut attached substantially concentrically to the body portion juxtaposed the annular element, the improvement comprising:

• the swivel nut having an open end, and a concave frustoconical surface located at a larger diameter than the recessed annular element and a sealing surface portion of the annular element generally positioned in alignment with a conic element tangent to the frustoconical surface.