Breastfeeding

medela pump - closed or open system?

A friend of mine is offering me her Medela Pump in Style.

But I heard somewhere that these pumps are open systems, and shouldn't be used second hand...

Anyone know for sure? 

Our Little Lady
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Avery - 8.2.07 | Asher - 5.12.10 | Audrey - 11.28.12

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