Bottle thread adapter wide to narrow 4 pack Bonnie Knows Breast

Bottle Thread Converter/Adapter Wide Mouth to Narrow/Standard (4-pack)

$10.99

Use with wide Lansinoh flange (wide) and standard bottle (Medela).

Wide-to-Narrow Bottle Conversion — Lets wide-mouth pump flanges (e.g. Lansinoh) connect securely to standard / narrow-neck bottles (like Medela, narrow Lansinoh, Ameda, Dr. Brown narrow neck).
Compatible with Many Pump & Bottle Brands — Allows use of wide-mouth breast shields with widely used narrow-neck bottles, adding versatility to your pumping setup.
4-Pack for Convenience — Includes four adapters — handy to keep extras at home, work, or in your pump bag.
Avoids Duckbill Interference & Promotes Leak-Resistant Seal — Designed as a “3rd generation bottle size changer” to avoid interfering with the pump duckbill and to screw easily onto both wide mouth flanges and standard bottles.
Good for Pumping & Storage Efficiency — Instead of transferring milk, you can pump directly into the bottles you already use — saving time and reducing handling.

We recommend that you use a bottle-stand as well to reduce the tipping-over of the bottle.

Use with wide Lansinoh flange (wide) and standard bottle (Medela).

Wide-to-Narrow Bottle Conversion — Lets wide-mouth pump flanges (e.g. Lansinoh) connect securely to standard / narrow-neck bottles (like Medela, narrow Lansinoh, Ameda, Dr. Brown narrow neck).
Compatible with Many Pump & Bottle Brands — Allows use of wide-mouth breast shields with widely used narrow-neck bottles, adding versatility to your pumping setup.
4-Pack for Convenience — Includes four adapters — handy to keep extras at home, work, or in your pump bag.
Avoids Duckbill Interference & Promotes Leak-Resistant Seal — Designed as a “3rd generation bottle size changer” to avoid interfering with the pump duckbill and to screw easily onto both wide mouth flanges and standard bottles.
Good for Pumping & Storage Efficiency — Instead of transferring milk, you can pump directly into the bottles you already use — saving time and reducing handling.

We recommend that you use a bottle-stand as well to reduce the tipping-over of the bottle.

If you use a wide-mouth breast shield — but prefer to store or feed with standard or narrow-neck bottles — this Bottle Thread Adapter (Wide-to-Narrow) 4-Pack is a simple, smart solution.

Each adapter lets you connect wide-mouth pump flanges (like those from Lansinoh or other wide-mouth systems) directly to standard / narrow-neck bottles (e.g., Medela, Ameda, narrow-neck Lansinoh, or narrow Dr. Brown bottles). This removes the need to transfer milk between containers — saving time, reducing spills, and minimizing contamination risk.

The adapters are designed thoughtfully: they avoid interference with the pump duckbill (so suction stays effective), and they screw on smoothly to both wide-mouth flanges and narrow bottles. Because they come in a 4-pack, you can keep a set at home, in your bag, or at work — or have spare adapters for different bottle brands.

Whether you’re pumping directly into bottles for storage, mixing and matching bottles across pumps, or juggling multiple feeding setups, this adapter set adds flexibility and convenience — and helps you make the most of your existing pump and bottle gear.

Product Details

Contents: 4 adapters per pack
Compatibility: Wide-mouth flanges (e.g. Lansinoh wide flange) → standard / narrow-neck bottles (e.g. Medela, Ameda, narrow-neck Lansinoh, narrow bottles from Dr. Brown, etc.)
Use Case: Convert wide-mouth pump flange threads to narrow-neck bottle threads — pump directly into standard bottles without extra transfers
Recommended: Use with a bottle stand or secure base, to reduce risk of tipping over when pumping.