Hi, I hope this video will help you. It shows how to assembly the parts. With regards whether to buy new parts or just sterilizing it, the good thing about Spectra breast pump is it has a pair of back flow protectors, making it a closed system pump. That means milk will never be in contact with the pump motor. This fact makes it more hygienic, more durable pump motor, and suitable for multiple user sharing. You simply need to have your individual collection kits (pair of breast flanges, valves, and back flow protectors). https://m.youtube.com/watch?time_continue=208&v=7FUTVVK9Ji0&ebc=ANyPxKqDtKsnHLcj0Oo_eZjc977DvTMgwp9RvFdPptwGifjElBzkbenEFpcgnvvYLSpFBKrJf50hDuOiSqz625kmFpwwZg5UFw
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