Silicone Flange Sizing Kit 5pcs 13–21mm for 24mm Breast Pumps

Flange Sizing Kit – 5 Silicone Inserts (13/15/17/19/21mm) for 24mm Breast Pump Flanges

Finding the right fit for your breast pump flange makes all the difference in your pumping experience. This 5-piece silicone flange sizing kit lets you easily reduce a standard 24mm flange tunnel to the size that works best for you — helping you pump more efficiently, more comfortably, and in less time. Made in Mainland China.

Whether you're just starting out or adjusting as your needs change, having the full range of sizes on hand means you'll always have the perfect fit ready to go.

Key Features

• 5 Sizes Included: One kit contains inserts in 13mm, 15mm, 17mm, 19mm, and 21mm — covering virtually every sizing need for those using a 24mm flange. Note: Not compatible with 27–28mm shields.
• Broad Compatibility: Designed to fit most 24mm wearable and standard electric breast pumps, including Spectra models. Simply insert into your existing 24mm flange to reduce the tunnel to your ideal size.
• Soft, Body-Safe Silicone: Crafted from gentle, food-grade silica gel that is soft against skin, flexible, and free from high-concern chemicals — safe for mom and baby.
• Easy to Clean: Dishwasher safe (top rack recommended). For thorough sanitation after each use, rinse with water at 100°C/212°F. Keeping your pumping accessories clean has never been simpler.
• Maximize Your Output: A correctly sized flange insert promotes better stimulation of milk flow and helps reduce pumping time while maximizing milk output — making every session more effective.
• Recommended Replacement: Nipple size can fluctuate throughout different stages of breastfeeding. For optimal comfort and effectiveness, replace flange inserts every 1–2 months.

What's in the Box?

• 5 × Silicone Flange Inserts (13mm, 15mm, 17mm, 19mm, 21mm)

Specifications

Perfect Pairing

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Frequently Asked Questions

Q: What breast pump models are compatible with this flange sizing kit?

A: This silicone flange sizing kit is designed to fit most 24mm wearable and standard electric breast pumps, including popular models like Spectra. It is not compatible with 27mm or 28mm shields. Always check your pump's flange size before purchasing.

Q: How do I know which flange insert size is right for me?

A: The correct size is typically determined by the diameter of your nipple (not including the areola). That's why this 5-piece kit — offering 13, 15, 17, 19, and 21mm inserts — is ideal if you're unsure of your size. You can try each insert to find the most comfortable and effective fit. If you already know your size, you can use the specific insert you need and keep the rest as backups.

Q: How do I clean the silicone flange inserts?

A: The inserts are dishwasher safe — place them on the top rack for best results. After each pumping session, it is recommended to rinse and sanitize the inserts with water at 100°C/212°F to maintain thorough hygiene for you and your baby.

Q: How often should I replace the flange inserts?

A: We recommend replacing the silicone flange inserts every 1–2 months, or sooner if you notice any changes in fit or comfort. Nipple size can naturally change throughout different stages of breastfeeding, so it's a good idea to re-evaluate your fit periodically.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.