Photo 1 of PumpMom-us Pump Bottle Adapter, Baby Bottle Thread Changer Converter for Spectra S1 S2 Wide Mouth Flanges to Use Standard Sized Bottles. Compatible with Medela, Ameda Narrow Neck Bottles

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Photo 1 of PumpMom-us Pump Bottle Adapter, Baby Bottle Thread Changer Converter for Spectra S1 S2 Wide Mouth Flanges to Use Standard Sized Bottles. Compatible with Medela, Ameda Narrow Neck BottlesPhoto 2 of PumpMom-us Pump Bottle Adapter, Baby Bottle Thread Changer Converter for Spectra S1 S2 Wide Mouth Flanges to Use Standard Sized Bottles. Compatible with Medela, Ameda Narrow Neck Bottles