The connection unit (10) has a connection section (14) for connection of a line section and another connection section (16) for connecting with a coupling element, where the line section is attached at another coupling element (2). The connection sections are formed by separate elements, which are firmly and fluid tightly connected with each another or screwed together. The connection section is partially designed in a non-cylindrical form i.e. peripheral groove (18), at an outer peripheral surface, where the connection unit is fixed in a base body (20) through the peripheral groove. An independent claim is also included for a device for simultaneous connecting of a set of line sections with another line section.
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