Original spare part prepared with silicone, for the Medela breast pump: Swing Maxi Flex. It works by connecting the motor to the breast pump and allows it to perform the vacuum to achieve the extraction of breast milk. It is not necessary to clean or sterilize the tube, because milk does not pass through the tube.
If for some reason it is sterilized, it would be left with steam inside, although nothing would happen, you will just notice that it starts to look bad. If you want to convert the old swing into swing flex you will need the connector, the funnel and the tube from the flex range.