Abstract: A device and method is provided for manufacturing at least two curved, joined tubes. The method includes extruding, without clamping, a blank in a modifiable-geometry mold cavity and placing the blank in the cavity by means of an entraining air stream, and then modifying the geometry of the mold cavity to clamp the blank and injecting a gas to shape the blank to the mold cavity geometry thus modified to obtain at least two curved, joined tubes. The device includes a mold cavity and at least one moving part for modifying a geometry of the mold cavity. The moving part is displaceable between a retracted position in which a blank can be placed in the mold cavity under the action of an air stream and a blank clamping position to allow formation of at least two curved, joined tubes upon blowing.