Freemie SlimFit Cups were made for use with Freemie rechargeable pumps, including Independence II, Liberty II and Rose. These cups are closed-system and have a barrier inside to prevent milk from backing up.
SlimFit5 and SlimFit6 Cups can be used with a new Spectra S1 Plus, S2 Plus, or 9+ Pump.
Use of Freemie Cups with an unapproved pump or "hack" is never recommended and may cause damage, malfunction, or injury.
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