Device for tightly connecting at least one evacuation pipe of a product with receiving means for receiving said product, said device comprising: - a first part comprising means for tightly connecting to the pipe; - a second part comprising means (17,18) for tight coupling with the receiving means; said first and second parts are configured to be tightly coupled to each other and comprise complementary means (4, 5) allowing the evacuation of the product through said first and second parts, from the evacuation pipe up to the receiving means, - - characterized in that the second part comprises a position sensor arranged to be actuated during the tight coupling to the receiving means and - in that the position sensor comprises an activation member arranged on the second part, said activation member being movable in a detection position only when the connecting device is tightly coupled to receiving means, in the direction and in the detection area of a detection member arranged on the first part, and - in that the second part comprises displacement means of the activation member of the position sensor, against the detection member of said position sensor, allowing the activation member to pass from a neutral position to a detection position, said displacement means being actuated during tight coupling to the receiving means, and - in that the displacement means are in the form of a leaf spring arranged at the coupling means with the means receiving, the activating member is mounted on the blade of said spring, and the spring is arranged to be compressed during the tight coupling to the receiving means so as to move the activation member in the detection position. - a first part comprising means for tightly connecting to the pipe; - a second part comprising means (17,18) for tight coupling with the receiving means; said first and second parts are configured to be tightly coupled to each other and comprise complementary means (4, 5) allowing the evacuation of the product through said first and second parts, from the evacuation pipe up to the receiving means, - - characterized in that the second part comprises a position sensor arranged to be actuated during the tight coupling to the receiving means and - in that the position sensor comprises an activation member arranged on the second part, said activation member being movable in a detection position only when the connecting device is tightly coupled to receiving means, in the direction and in the detection area of a detection member arranged on the first part, and - in that the second part comprises displacement means of the activation member of the position sensor, against the detection member of said position sensor, allowing the activation member to pass from a neutral position to a detection position, said displacement means being actuated during tight coupling to the receiving means, and - in that the displacement means are in the form of a leaf spring arranged at the coupling means with the means receiving, the activating member is mounted on the blade of said spring, and the spring is arranged to be compressed during the tight coupling to the receiving means so as to move the activation member in the detection position.