Device for manufacturing containers by blow-moulding, the device comprising: - a mould that comprises a wall defining a moulding cavity of vertical axis, the mould being provided with at least one pipe for the circulation of a heat-transfer fluid, this pipe having, on an external face of the mould, a heat-transfer fluid inlet orifice and a heat-transfer fluid outlet orifice; - a mould carrier (20, 22) in which the mould is removably mounted; - a plug provided with a heat-transfer fluid supply duct and with a heat-transfer fluid discharge duct, the plug being mounted so as to slide longitudinally on the mould carrier (20, 22) between a forwardmost, connection position in which the plug is fitted together with the inlet and outlet orifices (30, 32) of the mould and in which the supply duct and the discharge duct are connected simultaneously to the inlet orifice and the outlet orifice, respectively, and a rearmost, disconnection position in which the plug is disengaged from the inlet and outlet orifices (30, 32); characterized in that it comprises means for clamping the plug against the mould in the connection position, the clamping means allowing the plug to be removably attached to the mould in the forwardmost, connection position and comprising: - a dog that is borne fixedly by the mould in front of the plug when the mould is mounted on the mould carrier (20, 22); and - a clamping finger that is borne so as to be able to move on the plug between a clamping position in which the finger is latched behind the dog so as to longitudinally clamp the plug against the mould, and a release position in which the finger is offset relative to the dog so as to allow the plug to slide towards its rear, disconnection position; and in that the clamping finger can be latched behind the dog when the plug occupies a position between the forwardmost, connection position and a latching position that is intermediate between the rearmost, disconnection position and the forwardmost, connection position, the clamping means being arranged such that the clamping finger pulls the plug as far as the forwardmost, connection position even if the plug is not completely fitted together with the end pieces of the half-mould (14, 16). - a mould that comprises a wall defining a moulding cavity of vertical axis, the mould being provided with at least one pipe for the circulation of a heat-transfer fluid, this pipe having, on an external face of the mould, a heat-transfer fluid inlet orifice and a heat-transfer fluid outlet orifice; - a mould carrier (20, 22) in which the mould is removably mounted; - a plug provided with a heat-transfer fluid supply duct and with a heat-transfer fluid discharge duct, the plug being mounted so as to slide longitudinally on the mould carrier (20, 22) between a forwardmost, connection position in which the plug is fitted together with the inlet and outlet orifices (30, 32) of the mould and in which the supply duct and the discharge duct are connected simultaneously to the inlet orifice and the outlet orifice, respectively, and a rearmost, disconnection position in which the plug is disengaged from the inlet and outlet orifices (30, 32); - a dog that is borne fixedly by the mould in front of the plug when the mould is mounted on the mould carrier (20, 22); and - a clamping finger that is borne so as to be able to move on the plug between a clamping position in which the finger is latched behind the dog so as to longitudinally clamp the plug against the mould, and a release position in which the finger is offset relative to the dog so as to allow the plug to slide towards its rear, disconnection position;