module device (3) rotating the instrument carrier holder, intended to equip an automatic disinfection device and maintenance of a rotary instrument carrier, comprising a motor (5) capable of rotating the rotary instrument carrier.The motor (5) is housed in a cavity (32) closed by a lid (6) through which the drive shaft (50) and consisting of the assembly of two concentric parts (7, 8), one for tubular to be introduced into the opening (33) and provided with a peripheral seal system (J) adapted to seal with the module (30), and an inner seal assembly (T) adapted to perform seal with the shaft (50) and a second part (8) in form of a ring, inserted into a groove (74) the first part device (7), and comprising, besides a seal peripheral system ( S) adapted to seal with the first part (7), a central bore (75) for tightly traversed by the shaft (50), whose dimensions are adjusted to provide a seal by sliding clamping.
