Metal part comprising an outer wall delimiting at least two internal cavities separated by an internal wall , said metal part further comprising: - at least one internal orifice passing through said internal wall and connecting said cavities , - an external orifice associated with each internal orifice and passing through said outer wall , the respective axes of the internal orifice and of the associated external orifice being coincident, - an obturator that is associated with each pair of internal and external orifices and comprises: - a securing part secured in a sealing manner to the interior of the external orifice , - an adjustment part that is coaxial with the securing part and is inserted into the internal orifice associated with said external orifice over the entire length of said internal orifice, the adjustment part being formed such that a clearance (J), measured perpendicular to the axis of the internal orifice , exists between the adjustment part and the internal orifice , this clearance (J) being between a minimum clearance and a maximum clearance, the minimum clearance being defined such that the adjustment part does not come into contact with the internal orifice, the maximum clearance being a result of manufacturing tolerances, such that there is no or almost no fluidic communication between the internal cavities of the part. - at least one internal orifice passing through said internal wall and connecting said cavities , - an external orifice associated with each internal orifice and passing through said outer wall , the respective axes of the internal orifice and of the associated external orifice being coincident, - an obturator that is associated with each pair of internal and external orifices and comprises: - a securing part secured in a sealing manner to the interior of the external orifice , - an adjustment part that is coaxial with the securing part and is inserted into the internal orifice associated with said external orifice over the entire length of said internal orifice, the adjustment part being formed such that a clearance (J), measured perpendicular to the axis of the internal orifice , exists between the adjustment part and the internal orifice , this clearance (J) being between a minimum clearance and a maximum clearance, the minimum clearance being defined such that the adjustment part does not come into contact with the internal orifice, the maximum clearance being a result of manufacturing tolerances, such that there is no or almost no fluidic communication between the internal cavities of the part. - a securing part secured in a sealing manner to the interior of the external orifice , - an adjustment part that is coaxial with the securing part and is inserted into the internal orifice associated with said external orifice over the entire length of said internal orifice, the adjustment part being formed such that a clearance (J), measured perpendicular to the axis of the internal orifice , exists between the adjustment part and the internal orifice , this clearance (J) being between a minimum clearance and a maximum clearance, the minimum clearance being defined such that the adjustment part does not come into contact with the internal orifice, the maximum clearance being a result of manufacturing tolerances, such that there is no or almost no fluidic communication between the internal cavities of the part. <EOS>