Adapter

In an adapter for releasably coupling two tubular elements, which comprises a socket consisting of a first part of smaller diameter and a second part of larger diameter, the first socket part being dimensioned to fit frictionally a first one of the tubular elements to form a seat therefor and the second socket part having an outer thread, and a sleeve nut having an inner thread in threaded engagement with the outer thread:

• 1. the sleeve nut having an axial length exceeding that of the second socket part,
• a. the inner thread being arranged at one end of the sleeve nut and
• b. an inwardly extending flange at an end of the sleeve nut opposite to the one sleeve nut end, the flange and the second socket part presenting axially spaced shoulders sloping so that they converge towards each other in a radially outward direction, and
• 2. an elastically deformable solid sleeve of natural or synthetic rubber inserted in the sleeve nut between the shoulders,
• a. the sleeve having a maximum outer diameter which is slightly smaller than the inner diameter of the sleeve nut,
• b. the sleeve having a periphery defining a circumferentially extending trough-shaped recess,
• c. the sleeve having a cylindrical inner wall dimensioned to receive the second tubular element, and
• d. the sleeve having two annular end faces extending parallel to each other and peripendicularly to the axis of the sleeve for engagement with the shoulders.