---
product_id: 590637508
title: "3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms"
brand: "nuliie"
price: "$26.88"
currency: USD
in_stock: true
reviews_count: 13
category: "Nuliie"
url: https://www.desertcart.us/products/590637508-3-in-1-flange-sizing-kit-13-15-17-19
store_origin: US
region: United States of America
---

# 5 precise flange sizes (13-21mm) BPA-free, food-grade silicone Dishwasher safe + cleaning brush included 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms

**Brand:** nuliie
**Price:** $26.88
**Availability:** ✅ In Stock

## Summary

> 👩‍🍼 Pump smarter, not harder — comfort and efficiency in every size!

## Quick Answers

- **What is this?** 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms by nuliie
- **How much does it cost?** $26.88 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/590637508-3-in-1-flange-sizing-kit-13-15-17-19)

## Best For

- nuliie enthusiasts

## Why This Product

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

## Key Features

- • **Hygienic & Safe:** Made from BPA-free, phthalate-free silicone that’s dishwasher safe and easy to clean with the included brush.
- • **Versatile Compatibility:** Designed to fit most 24mm breast pump shields, compatible with popular brands like Spectra and Medela.
- • **Boost Pumping Efficiency:** Soft silicone inserts enhance suction and reduce discomfort, making every session smoother and faster.
- • **Custom Fit for Ultimate Comfort:** Five size options ensure a perfect seal and painless pumping experience tailored to your unique needs.
- • **Smart Measurement Tool Included:** Free nipple ruler helps you track size changes and select the ideal flange insert for maximum comfort.

## Overview

The Nuliie 3-in-1 Flange Sizing Kit offers 10 BPA-free silicone inserts in five precise sizes (13-21mm) to customize the fit for most 24mm breast pump shields. Designed to boost pumping comfort and efficiency, this kit includes a cleaning brush and nipple measurement ruler, ensuring hygienic use and perfect sizing throughout breastfeeding stages. Compatible with leading pump brands, it’s a must-have for modern moms seeking painless, effective pumping sessions.

## Description

To create thoughtful products and caring experiences that bring comfort and joy to moms-supporting their wellbeing as the true wellspring of every stage of motherhood. Nuliie believes every mother deserves comfort, understanding, and care—because when moms feel supported and joyful, love flows freely. S32 Hands-Free Breast Pump Ultra-comfort fit for effortless, clean, and quiet milk expression anytime, anywhere. S32 Hands-Free Breast Pump Ultra-comfort fit for effortless, clean, and quiet milk expression anytime, anywhere. Manual Breast Pump Designed to make milk expression a comfortable and effortless part of your day. Manual Breast Pump Designed to make milk expression a comfortable and effortless part of your day. Disposable Nursing Pads Soft, breathable, and reliable support for every breastfeeding moment. Disposable Nursing Pads Soft, breathable, and reliable support for every breastfeeding moment. Nuliie Colostrum Collector Kit Making every drop of liquid gold easy to collect, store, and nourish your baby. Nuliie Colostrum Collector Kit Making every drop of liquid gold easy to collect, store, and nourish your baby. Nuliie Flange Inserts S32 Hand-free Breast Pump Accessories Breastmilk Storage Bags Reusable Silicone Mlik Bags

Review: Breastfeeding necessity - I’m so glad I found this flange sizing kit—it has made a huge difference in my pumping experience. The silicone is really high-quality, soft but durable, and super easy to clean, which is a must when you’re using something this often. I love that it comes with both a sizing chart and a conversion chart. It took all the guesswork out of figuring out the right fit, and having everything included made the process so much less stressful. The little cleaning tool it comes with is also such a thoughtful bonus—it makes keeping everything sanitary quick and easy. The biggest difference for me has been comfort and output. Since using the correct size, I’ve noticed a significant increase in my milk supply and way less pain while pumping. It’s honestly been a game changer. If you’re breastfeeding or pumping and unsure about your flange size, I highly recommend this kit. It’s simple, effective, and made a noticeable difference for me right away.
Review: No-frills variety pack gives you plenty of options - Summary: it’s exactly as advertised. You get a variety of flange inserts to test, a very handy brush to wash them, and a nipple guide to measure. Easy, straightforward, can’t go wrong buying the variety pack. More detail: it’s packaged well, each set of flange inserts comes in its own plastic packaging in the box. On each insert, the size is printed on the rim of it, so it’s fairly easy to see what size you’re working with. The included brush makes it much easier to clean, especially if you get bits of milk stuck around the edges, which is pretty common for me. It’s difficult to get it fully clean when using a traditional bottle brush, but the included brush is made of a soft material that really gets the milk off. It fit perfectly in my spectra flanges, and fit pretty decently in my Mandela ones- it just needed a little bit more finagling to get a flush fit. This was a good way to test out a variety of different sizes quickly. Tip: the silicone can stick a little, and create friction on your sensitive areas. A dab of coconut oil on your nipples before you pump, and you won’t have this problem. You can also apply the oil directly to the flange insert, but it gets a bit messy. Putting it on your skin is just as effective, without making the flange overly greasy.

## Features

- [HIGH COMPATIBILITY] Nuliie flange sizing kit 13/15/17/19/21mm (10pcs) ffits most 24mm flanges/shields for electric double breast pump and manual breast pump use. It will reduce the 24mm shield nipple tunnel down to correct size. Note: Not compatible with 27-28mm shields.
- [MUST-HAVE ACCESSORY FOR BREAST PUMPS] Enhance your pumping comfort and efficiency with our essential flange inserts. The soft and flexible silicone provides a gentle and secure fit, helping to create a smoother and more comfortable pumping experience. A must-have for any breastfeeding mother who needs to pump milk.
- [SAFE & EASY TO CLEAN] Ensure safety and maintain the performance of your breast pump with our flange inserts. Made from food-grade liquid silicone and free from BPA, these inserts are easy to clean and dishwasher safe. We recommend washing them promptly after each use and replacing every 2 months to keep optimal functionality. Plus, includes a complimentary cleaning brush.
- [CARING SERVICE] With our silicone flange inserts, you receive a free nipple measurement ruler to help you choose the perfect size. Compare the size of your nipple before and after pumping to ensure the most comfortable and effective fit. We provide unparalleled after-sale for mothers by answering your questions anytime and anywhere.
- [FRIENDLY REMINDER] Nipple size can vary throughout different breastfeeding stages, requiring different sizes of flange inserts for your breast pump. If you're aware of your exact nipple size, we recommend purchasing the corresponding size directly. However, if you're unsure, we suggest starting with our 10-pack of Flange Inserts, which contains five different sizes to ensure you find the perfect fit.
- Your order may come with either the new or old packaging, shipped randomly. Rest assured, both versions guarantee the same high-quality product inside.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CMPBBHMZ |
| Additional Features | Comfort and Efficiency, Lightweight, Painless |
| Best Sellers Rank | #128 in Baby ( See Top 100 in Baby ) #1 in Electric Breast Pumps |
| Brand | Nuliie |
| Brand Name | Nuliie |
| Color | Transparent |
| Customer Reviews | 4.6 out of 5 stars 3,792 Reviews |
| Included Components | 13/15/17/19/21mm Flange Inserts (10PCS), Cleaning Brush, Nipple Ruler * 1PCS |
| Is the item dishwasher safe? | Yes |
| Item Weight | 0.04 Pounds |
| Manufacturer | Nuliie |
| Manufacturer Part Number | NEMMZH |
| Material | Silicone |
| Material Type | Silicone |
| Material Type Free | BPA Free, Bisphenol-S (BPS) Free, Phthalate Free |
| Model Name | NEMMZH |
| Model Number | NEMMZH |
| Number of Items | 10 |
| Size | 13/15/17/19/21 mm 10PCS for 24 mm shield |
| Special Feature | Comfort and Efficiency, Lightweight, Painless |
| Unit Count | 10 Count |

## Product Details

- **Brand:** Nuliie
- **Included Components:** 13/15/17/19/21mm Flange Inserts (10PCS), Cleaning Brush, Nipple Ruler * 1PCS
- **Material:** Silicone
- **Material Type Free:** BPA Free, Bisphenol-S (BPS) Free, Phthalate Free
- **Special Feature:** Comfort and Efficiency, Lightweight, Painless

## Images

![3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms - Image 1](https://m.media-amazon.com/images/I/71n4KJaiDYL.jpg)
![3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms - Image 2](https://m.media-amazon.com/images/I/71HZZIrZBZL.jpg)
![3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms - Image 3](https://m.media-amazon.com/images/I/71Xq0YTQGnL.jpg)
![3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms - Image 4](https://m.media-amazon.com/images/I/71Wt3oX6eBL.jpg)
![3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms - Image 5](https://m.media-amazon.com/images/I/61b-DWnnGOL.jpg)

## Available Options

This product comes in different **Size, Unit Count** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Breastfeeding necessity
*by G***I on April 15, 2026*

I’m so glad I found this flange sizing kit—it has made a huge difference in my pumping experience. The silicone is really high-quality, soft but durable, and super easy to clean, which is a must when you’re using something this often. I love that it comes with both a sizing chart and a conversion chart. It took all the guesswork out of figuring out the right fit, and having everything included made the process so much less stressful. The little cleaning tool it comes with is also such a thoughtful bonus—it makes keeping everything sanitary quick and easy. The biggest difference for me has been comfort and output. Since using the correct size, I’ve noticed a significant increase in my milk supply and way less pain while pumping. It’s honestly been a game changer. If you’re breastfeeding or pumping and unsure about your flange size, I highly recommend this kit. It’s simple, effective, and made a noticeable difference for me right away.

### ⭐⭐⭐⭐⭐ No-frills variety pack gives you plenty of options
*by T***U on July 12, 2025*

Summary: it’s exactly as advertised. You get a variety of flange inserts to test, a very handy brush to wash them, and a nipple guide to measure. Easy, straightforward, can’t go wrong buying the variety pack. More detail: it’s packaged well, each set of flange inserts comes in its own plastic packaging in the box. On each insert, the size is printed on the rim of it, so it’s fairly easy to see what size you’re working with. The included brush makes it much easier to clean, especially if you get bits of milk stuck around the edges, which is pretty common for me. It’s difficult to get it fully clean when using a traditional bottle brush, but the included brush is made of a soft material that really gets the milk off. It fit perfectly in my spectra flanges, and fit pretty decently in my Mandela ones- it just needed a little bit more finagling to get a flush fit. This was a good way to test out a variety of different sizes quickly. Tip: the silicone can stick a little, and create friction on your sensitive areas. A dab of coconut oil on your nipples before you pump, and you won’t have this problem. You can also apply the oil directly to the flange insert, but it gets a bit messy. Putting it on your skin is just as effective, without making the flange overly greasy.

### ⭐⭐⭐⭐⭐ Soft , good fit
*by Y***R on December 13, 2025*

I love that it includes multiple sizes (13, 15, 17, 19, and 21mm), which makes it easy to find the perfect fit without having to buy separate inserts. The sizing variety is especially helpful for moms who are still figuring out what works best for them. The silicone is soft, flexible, and very comfortable against the skin. Once inserted into my 24mm flange, it stayed securely in place and created a better seal, which noticeably improved comfort and suction. Pumping felt less painful and more efficient compared to using a standard hard plastic flange. Cleaning is simple, and the inserts seem durable even after multiple washes. This kit is a great value for the price and perfect for moms who want a more customized, comfortable pumping experience. Highly recommend for anyone using 24mm breast pump flanges who wants better comfort and fit!

## Frequently Bought Together

- Nuliie 10PCS Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps, Silicone Flanges Insert for Momcozy/Spectra Electric Breast Pumps, Pumping Essential Kit for Moms
- Medela Manual breast pump with Flex Shields Harmony Single Hand for More Comfort and Expressing More Milk
- haakaa Manual Breast Pump for Breastfeeding, Silicone, Clear 4oz/100ml

---

## 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.us/products/590637508-3-in-1-flange-sizing-kit-13-15-17-19](https://www.desertcart.us/products/590637508-3-in-1-flange-sizing-kit-13-15-17-19)

---

*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-10*