An adapter piece (11) is incorporated which has a tubular connection (12) insertable in the socket-shaped connecting piece (2), to which a cone shaft (13) connects. The cone shaft is enclosed by a tubular part (14) provided with an inner thread (17). The tubular part is connected with its one end to a flange-shaped part (15), which is connected with the tubular connection. In the hose (1) is insertable a spiral mandarin (20), which is provided with a socket-shaped end-piece (22) applicable to the first adapter piece (11). There may be a second adapter piece (24) with a socket-shaped connecting piece connected via a flexible connection bridge (25).
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