Abstract: The invention relates to a movable enclosure for the replacement and transportation of contaminated parts, as well as to a complementary confinement casing. The enclosure comprises a confinement body in which is received a cylinder having at least two cavities. Each cavity contains a gripping head, which can be introduced into an opening of the body and intended to be tightly arranged in the extension of the housing of a part to be replaced. The locking of the part onto the head is obtained by manipulating a pull handle located in the handling rod and used for displacement of each gripping head in its cavity. Application to interventions on nuclear installations located in confinement cells.