The present invention relates to a device (100) comprising a body (1) defining a containment volume (2) for a fluid for medical use and equipped with a terminal (3) which defines a conduit (4) configured to put the containment volume (2) into communication with the outside. The device (100) comprises a cap support (10) integral with the body (1) and disposed outside the containment volume (2), the cap support (10) defining an internal volume (11) housing the terminal (3). The device (100) comprises a tip cap (20) associable with the cap support (10) by first constraint means (30) and associable with the terminal (3) by second constraint means (31). The tip cap (20) is configured to assume at least a first stable position and a second stable position.In the first stable position, the tip cap (20) is integral with the cap support (10), in the first stable position a first portion (21) of the tip cap (20) being housed in the internal volume (11) of the cap support (10) and a second portion (22) of the tip cap (20) emerging from the internal volume (11) of the cap support (10). In the second stable position, the tip cap (20) is integral with the terminal (3) and is completely housed in the internal volume (11) of the cap support (10). The containment volume (2) is in communication with the outside when the tip cap (20) assumes the first stable position and is sealed when the tip cap (20) assumes the second stable position.
