Originally Posted by FischK
On the Pump-in-Style Advanced Personal Pumps, the milk does not flow through the tubing unless there's an overflow from the bottle. I don't believe that would happen very often.
You can buy the tubing separately, but it probably makes more sense to buy the parts that are actually in contact with the milk (bottles, etc.).
However, the problem with buying a used pump is not so much hygiene, but the possibility that...