Silicone Flange Inserts Sizing Kit 13–21mm

Silicone Flange Inserts Sizing Kit 13–21mm | Breast Pump

$16.51 $22.04

Flange Sizing Kit – Silicone Inserts for Wearable Breast Pumps

Finding the perfect fit for your breast pump just got easier. This Flange Sizing Kit includes soft, food-grade silicone inserts in five sizes (13mm, 15mm, 17mm, 19mm, and 21mm), designed to reduce the 24mm nipple tunnel down to your ideal size. Whether you're in the early days of breastfeeding or well into your journey, these inserts help you dial in a snug, comfortable fit that supports efficient pumping and better milk output.

Made in Mainland China.

Why You'll Love These Flange Inserts

Wide Compatibility: Works with virtually all major wearable breast pumps, including Momcozy M9, M6, M5, S12 Pro, V1 Pro, V2 Pro, Eufy E10, S1, S1 Pro, Spectra, Medela, TSRETE, Lasionh, Nuliie, NCVI, Paruu, NaNaLazy, and MOMMED pumps. Reduces the standard 24mm tunnel to your correct size.
5 Size Options in One Kit: Choose between a 5-piece set (one of each size) or a 10-piece set (two of each size) — ideal if you're still figuring out your best fit. Sizes available: 13mm, 15mm, 17mm, 19mm, and 21mm.
Customized Comfort for Every Stage: Nipple size can change throughout breastfeeding, so having multiple sizes on hand means you're always ready to adjust. Soft silicone conforms gently for a snug, non-irritating fit.
Engineered for Pumping Efficiency: The gentle silicone material is designed to stimulate natural milk flow and minimize session time, helping you maximize milk output with every pump.
BPA-Free & Baby-Safe: Crafted from frosted, transparent food-grade silicone with no BPA or high-concern chemicals — safe for you and your little one.
Easy to Clean: Rinse with warm soapy water after each use. Sterilize with boiling water or steam at approximately 100°C (212°F). Replace inserts every 1–2 months for best results.

Product Specifications

Material: Food-grade silicone (BPA-free, frosted transparent)
Available Sizes: 13mm, 15mm, 17mm, 19mm, 21mm
Pack Options: 5-piece or 10-piece set
Compatibility: Fits most wearable breast pump shields with a 24mm tunnel
Model: M5
Origin: Made in Mainland China

Frequently Asked Questions

Q: What sizes are included in the flange sizing kit?

A: The kit includes five sizes: 13mm, 15mm, 17mm, 19mm, and 21mm. These silicone flange inserts are designed to reduce a standard 24mm breast pump tunnel down to your correct nipple size. If you're unsure of your size, we recommend the 10-piece set so you can try all sizes and find your ideal fit.

Q: Are these flange inserts compatible with my breast pump?

A: Yes — these inserts are designed for wide compatibility. They work with most major wearable breast pump models including Momcozy M9, M6, M5, S12 Pro, V1 Pro, V2 Pro, Eufy E10, S1, S1 Pro, Spectra, Medela, TSRETE, Lasionh, Nuliie, NCVI, Paruu, NaNaLazy, and MOMMED pumps, among others.

Q: How do I clean and care for the silicone inserts?

A: Wash the inserts after each pumping session with warm soapy water, then rinse thoroughly. For sterilization, use boiling water or steam at around 100°C (212°F). It is recommended to replace your flange inserts every 1–2 months to maintain hygiene and optimal performance.

Q: Are these inserts safe for me and my baby?

A: Absolutely. The inserts are made from frosted, food-grade silicone that is completely BPA-free and free from high-concern chemicals, making them safe for both nursing mothers and babies.

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.