The invention relates to an internal high pressure forming installation (1) comprising a form tool (2) consisting of an upper die (3) and a lower die (4), the cavities (5) thereof forming a form chamber (6) for a peripherally closed hollow profiled element (7) to be inserted therein. Said installation (1) comprises at least one axial punch (8) which is used to seal the hollow profiled element (7) at one end (9) and comprises an axial through channel (10), by which means an internal high pressure can be produced by a pressurised fluid in the hollow profiled element (7) in order to enlarge the same. The inventive installation (1) also comprises a rapid filling device (11) provided with a filling attachment (12) with a filling borehole (13),(29) which has a diameter that is larger than that of the through channel (10) of the axial punch (8), and which is used to fill the hollow profiled element (7) with pressurised fluid when the axial punch (8) is set back from the respective hollow profiled end (9). The filling attachment (12) has a through borehole (14) that is penetrated by the axial punch (8) during the forming of the hollow profiled element (7). The aim of the invention is to be able to easily produce hollow profiled elements (7) formed by internal high pressure, on a large scale, by means of a rapid filling device (11) that is integrated into the installation (1) and is used to fill the hollow profiled element (7). To this end, the filling attachment is connected to a transport device that places the filling attachment (12) in a contact position on the form tool (2), and then in a position at a distance from the form tool after the filling process.