---
product_id: 549083468
title: "Flange Insert 6PCS 17/19/21mm for Momcozy S9/S9pro/S10/S12/S12pro/Medela/Tsrete/Spectra/Bellababy etc 24mm Wearable Breast Pump, Reduce 24mm Tunnel Down to Other Correct Size"
brand: "semai"
price: "VT3952"
currency: VUV
in_stock: true
reviews_count: 9
category: "Semai"
url: https://www.desertcart.vu/products/549083468-flange-insert-6pcs-17-19-21mm-for-momcozy-s9-s9pro
store_origin: VU
region: Vanuatu
---

# 3 sizes per pack (17/19/21mm) BPA-free food-grade silicone Compatible with 20+ pump brands Flange Insert 6PCS 17/19/21mm for Momcozy S9/S9pro/S10/S12/S12pro/Medela/Tsrete/Spectra/Bellababy etc 24mm Wearable Breast Pump, Reduce 24mm Tunnel Down to Other Correct Size

**Brand:** semai
**Price:** VT3952
**Availability:** ✅ In Stock

## Summary

> 🎯 Find your perfect fit, pump smarter, and join the mama comfort revolution!

## Quick Answers

- **What is this?** Flange Insert 6PCS 17/19/21mm for Momcozy S9/S9pro/S10/S12/S12pro/Medela/Tsrete/Spectra/Bellababy etc 24mm Wearable Breast Pump, Reduce 24mm Tunnel Down to Other Correct Size by semai
- **How much does it cost?** VT3952 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/549083468-flange-insert-6pcs-17-19-21mm-for-momcozy-s9-s9pro)

## Best For

- semai enthusiasts

## Why This Product

- Trusted semai brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Pump Like a Pro:** Custom sizing reduces discomfort, speeds sessions, and boosts milk output—don’t settle for standard.
- • **Safe & Hygienic:** Made from BPA-free, transparent silicone—easy to clean and sterilize for peace of mind.
- • **Soft-Touch Comfort:** Gentle silicone material prevents nipple irritation and enhances pumping efficiency.
- • **Perfect Fit, Every Pump:** Multiple flange sizes ensure smooth milk flow and ultimate comfort.
- • **Universal Compatibility:** Works seamlessly with top wearable pumps like Momcozy, Medela, Spectra & more.

## Overview

This 6-piece flange insert set (17/19/21mm) is crafted from BPA-free food-grade silicone to provide a soft, comfortable fit that reduces nipple irritation. Compatible with over 20 popular wearable breast pump brands including Momcozy, Medela, and Spectra, it customizes the standard 24mm flange size for optimal milk flow and pumping efficiency. Easy to clean and sterilize, these inserts are a must-have for any pumping mom seeking comfort, speed, and better milk expression.

## Description

desertcart.com : Flange Insert 6PCS 17/19/21mm for Momcozy S9/S9pro/S10/S12/S12pro/Medela/Tsrete/Spectra/Bellababy etc 24mm Wearable Breast Pump, Reduce 24mm Tunnel Down to Other Correct Size : Baby

Review: Life saver for a new mama! - Such a great product for a new mama learning to pump. I was on my third child when I bought these and I should have bought them sooner. They fit into my MomCozy S12 Pro Handless Pumps and it was a breeze figuring out what size I was. Totally recommend!!! Especially for the price.
Review: Game changer! 100% recommend - Its amazing how much a difference it makes when you have the right size flanges. I measure at a 18mm and 20mm. I use the 19mm on both sides and it works perfectly. These inserts make everything about pumping so much more comfortable. I use them in my legendairy milk Duette, Elvie Stride and Avent manual pump. They are made of sillicone which alone feels so much better than those hard plastic flanges. But once you find your right size it is a true game changer. Pumping no longer feels painful, no more pinching no more uncomfortable friction that feels like your going to blister no more feeling of bruising. These make it comfortable so that I am able to relax and do a full session of Pumping but also speed things up to so that i dont have to pump as long and still empty myself. If only I had these at the very beginning of my Pumping experience when i was power Pumping to increase milk production. I definitely recommend to any mama if they are considering Pumping after birth to buy these in advance. Make sure you have multiple sizes on hand because your size will change. It will change after birth, it will change once baby starts feeding or if your pumping. 100% recommend to all mamas, measure yourself we are not all the standard flange size sold with our pumps. Finding your true size changes everything!

## Features

- Compatibility: The Flange Inserts are wearable breast pump accessories, suitable for almost any wearable breast pump(not for 27mm shield). Use with 24mm Hands-Free breast pump Shields for example, compatible with Momcozy S9/S9 Pro/S10/S12/S12 Pro/TSRETE/Medela/Spectra/Elvie/Willow/Bellaaby/Motif Luna/Ameda MYA/Ainsir/Phanpy/Lulia/NaNaLazy/Luxlady/kidzio/eulumap/Teexin/Fisroa/KISSBOBO/Goldeep/BIOBOO/Mumeasy/Nanawawa/TOVVILD etc.
- Multiple Size Options: Our flange size has 4 combinations, 6PCS: 13/15/17, 15/17/19, 17/19/21,10PCS :13/15/17/19/21. Different Periods Provide More Cozy Experience, selection of the right flange size can help the breast milk to drain smoothly.
- Safety Material: made of transparent food grade silicone material. Our product is BPA-free, easy to clean, you can use it with confidence. Before use Can be sanitized with water steam, boiling water or microwave-steam bags.
- Soft-Touch: Flange insert Soft Comfortable Material, Snug Fit can comfort and efficient pumping, helping to avoid nipple damage or irritation.
- Serve Love: If for any reason you are not satisfied with your purchase, please cont**t us, our service team will offer you the best solution.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN  | B0CDLSZPG5 |
| Best Sellers Rank | #18,368 in Baby ( See Top 100 in Baby ) #251 in Electric Breast Pumps |
| Customer Reviews | 4.7 4.7 out of 5 stars (746) |
| Date First Available  | August 3, 2023 |
| Item model number  | BP06-2 |
| Manufacturer  | semai |
| Product Dimensions  | 4.9 x 4.9 x 3.74 inches; 2.4 ounces |

## Product Details

- **Brand:** semai
- **Item Weight:** 0.07 Kilograms
- **Material:** Silicone
- **Number of Items:** 6
- **Special Feature:** Painless

## Images

![Flange Insert 6PCS 17/19/21mm for Momcozy S9/S9pro/S10/S12/S12pro/Medela/Tsrete/Spectra/Bellababy etc 24mm Wearable Breast Pump, Reduce 24mm Tunnel Down to Other Correct Size - Image 1](https://m.media-amazon.com/images/I/71nauANXoRL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Will these insert work for the modify twist, or lansioh hand pump?**
A: I have the twist and I just put it on the 24 mm flange and I guess it works  cause it pumps

## Customer Reviews

### ⭐⭐⭐⭐⭐ Life saver for a new mama!
*by A***R on August 3, 2025*

Such a great product for a new mama learning to pump. I was on my third child when I bought these and I should have bought them sooner. They fit into my MomCozy S12 Pro Handless Pumps and it was a breeze figuring out what size I was. Totally recommend!!! Especially for the price.

### ⭐⭐⭐⭐⭐ Game changer! 100% recommend
*by C***E on October 14, 2023*

Its amazing how much a difference it makes when you have the right size flanges. I measure at a 18mm and 20mm. I use the 19mm on both sides and it works perfectly. These inserts make everything about pumping so much more comfortable. I use them in my legendairy milk Duette, Elvie Stride and Avent manual pump. They are made of sillicone which alone feels so much better than those hard plastic flanges. But once you find your right size it is a true game changer. Pumping no longer feels painful, no more pinching no more uncomfortable friction that feels like your going to blister no more feeling of bruising. These make it comfortable so that I am able to relax and do a full session of Pumping but also speed things up to so that i dont have to pump as long and still empty myself. If only I had these at the very beginning of my Pumping experience when i was power Pumping to increase milk production. I definitely recommend to any mama if they are considering Pumping after birth to buy these in advance. Make sure you have multiple sizes on hand because your size will change. It will change after birth, it will change once baby starts feeding or if your pumping. 100% recommend to all mamas, measure yourself we are not all the standard flange size sold with our pumps. Finding your true size changes everything!

### ⭐⭐⭐⭐⭐ HEAVILY RECOMMEND!!
*by K***E on November 18, 2025*

Love these! Great quality and very durable. Fit any 24mm flange and if you need to double them for bigger flanges they also do great doubled up. These SAVED my nipples and milk supply. Ladies! If you pump PLEASE measure your nipples and get the correct flange sizes! They work wonders! Went from making less than 1-2oz a session (wrong flanges) to making 10-12oz a session (after using the right sizes)! NOTE: if you purchase these make sure you purchase 2 or find a set that sells 2. These only come with 1 piece of each size. So you will need to buy 2 if you want/need the same size for each nipple. Ive purchased these 3 times now and they are super helpful, I forgot the first 2 times that I needed to buy it twice to have enough for both sides lol. 😂

## Frequently Bought Together

- Flange Insert 6PCS 17/19/21mm for Momcozy S9/S9pro/S10/S12/S12pro/Medela/Tsrete/Spectra/Bellababy etc 24mm Wearable Breast Pump, Reduce 24mm Tunnel Down to Other Correct Size
- Medela Manual breast pump with Flex Shields Harmony Single Hand for More Comfort and Expressing More Milk
- Lansinoh Stay Dry Disposable Nursing Pads, Soft and Super Absorbent Breast Pads, Breastfeeding Essentials for Moms, 200 Count

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.vu/products/549083468-flange-insert-6pcs-17-19-21mm-for-momcozy-s9-s9pro](https://www.desertcart.vu/products/549083468-flange-insert-6pcs-17-19-21mm-for-momcozy-s9-s9pro)

---

*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-02-09*