---
product_id: 428185457
title: "Willow Breast Pump Sizing Insert | 19mm for 15mm-17mm Nipple Size | Improve Fit for Willow Wearable Breast Pump Flanges & Containers 24mm Only"
brand: "willow"
price: "10852 kr"
currency: ISK
in_stock: true
reviews_count: 5
category: "Willow"
url: https://www.desertcart.is/products/428185457-willow-breast-pump-sizing-insert-19mm-for-15mm-17mm-nipple
store_origin: IS
region: Iceland
---

# Precise 19mm sizing insert Soft, flexible silicone material Reusable & easy to clean Willow Breast Pump Sizing Insert | 19mm for 15mm-17mm Nipple Size | Improve Fit for Willow Wearable Breast Pump Flanges & Containers 24mm Only

**Brand:** willow
**Price:** 10852 kr
**Availability:** ✅ In Stock

## Summary

> 📏 Fit matters: Upgrade your Willow pump comfort game!

## Quick Answers

- **What is this?** Willow Breast Pump Sizing Insert | 19mm for 15mm-17mm Nipple Size | Improve Fit for Willow Wearable Breast Pump Flanges & Containers 24mm Only by willow
- **How much does it cost?** 10852 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/428185457-willow-breast-pump-sizing-insert-19mm-for-15mm-17mm-nipple)

## Best For

- willow enthusiasts

## Why This Product

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

## Key Features

- • **Pump Anywhere, Anytime:** Enhances the only fully enclosed, wearable breast pump that fits your busy lifestyle.
- • **Seamless Compatibility:** Designed exclusively for Willow 24mm flanges, guaranteeing spill-proof, wearable pumping freedom.
- • **Hassle-Free Maintenance:** Reusable and easy to clean, keeping your pump hygienic without extra effort.
- • **Soft Silicone Flexibility:** Gentle, flexible silicone adapts comfortably to your body for a pain-free pumping experience.
- • **Perfect Fit, Maximum Comfort:** Tailored 19mm insert ensures flawless fit for smaller nipples, boosting pumping efficiency.

## Overview

The Willow Breast Pump Sizing Insert (19mm) is a flexible silicone accessory designed to improve fit and comfort for users with smaller nipples (15-17mm) when using the 24mm Willow wearable breast pump flange. It is reusable, easy to clean, and exclusively compatible with Willow Generations 2 and 3 pumps, ensuring a spill-proof, discreet pumping experience anytime, anywhere.

## Description

Designed for the perfect fit and performance with Willow Wearable Breast Pump. Sizing Inserts make pumping more comfortable for mamas with smaller flange sizes. See size chart in images.

Review: Best for willow - If you own a willow pump these are the best for it. Do check the size accurately before buying though. These are very soft and fit perfectly with the willow. Cheaping out on these are a bad idea, the originals are much better
Review: Willow Go flange insert - Insert firs perfect inside the 24mm flange for the Willow Go. Its exactally what I needed for a solid pumping session.

## Features

- IMPROVE FIT & COMFORT FOR YOUR WILLOW PUMP: Designed for the perfect fit and performance with Willow Wearable Breast Pump. Sizing is everything when it comes to pumping performance.
- FLEXIBLE SILICONE: If your flange size is smaller than 21mm, use these sizing inserts with a 24mm Willow Breast Pump flange to improve fit. Reference the sizing guide on this page for sizing instructions.
- EASY ASSEMBLY: Slip them into 24mm flanges or container tunnels for a seamless fit and comfort.
- EASY TO USE: Sizing Inserts are reusable, dishwasher safe and easy to clean. Willow recommends replacing sizing inserts regularly for optimal performance.
- USE WITH WILLOW PUMP: Exclusively designed to work with the Willow Wearable Breast Pump Generations 2 and 3. The only wearable pump that is totally enclosed and spill-proof in any position. Pump whenever you want and wherever you want.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09B7WMGGQ |
| Brand | Willow |
| Country of Origin | USA |
| Customer Reviews | 4.6 out of 5 stars 718 Reviews |
| Is Dishwasher Safe | No |
| Is the item dishwasher safe? | No |
| Manufacturer | Willow |
| Manufacturer Part Number | SZ1964 |
| Material | Silicone |
| Material Type Free | Lead Free |
| Model number | SZ1964 |
| Operation Mode | Manual |
| Product Style | Compact |
| Size | 19mm |
| Special Feature | Wearable |
| Special Features | Wearable |
| UPC | 858298006613 |

## Product Details

- **Brand:** Willow
- **Operation Mode:** Manual
- **Special Feature:** Wearable
- **Material:** Silicone
- **Material Type Free:** Lead Free
- **Is Dishwasher Safe:** No
- **Style:** Compact
- **Size:** 19mm
- **UPC:** 858298006613
- **Manufacturer:** Willow

## Images

![Willow Breast Pump Sizing Insert | 19mm for 15mm-17mm Nipple Size | Improve Fit for Willow Wearable Breast Pump Flanges & Containers 24mm Only - Image 1](https://m.media-amazon.com/images/I/31LUxe1lEfL.jpg)
![Willow Breast Pump Sizing Insert | 19mm for 15mm-17mm Nipple Size | Improve Fit for Willow Wearable Breast Pump Flanges & Containers 24mm Only - Image 2](https://m.media-amazon.com/images/I/51hgimPoA7L.jpg)
![Willow Breast Pump Sizing Insert | 19mm for 15mm-17mm Nipple Size | Improve Fit for Willow Wearable Breast Pump Flanges & Containers 24mm Only - Image 3](https://m.media-amazon.com/images/I/71HR4gJZuJL.jpg)
![Willow Breast Pump Sizing Insert | 19mm for 15mm-17mm Nipple Size | Improve Fit for Willow Wearable Breast Pump Flanges & Containers 24mm Only - Image 4](https://m.media-amazon.com/images/I/41+Tfn3NCkL.jpg)
![Willow Breast Pump Sizing Insert | 19mm for 15mm-17mm Nipple Size | Improve Fit for Willow Wearable Breast Pump Flanges & Containers 24mm Only - Image 5](https://m.media-amazon.com/images/I/71PxqF3oeYL.jpg)

## Available Options

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

## Questions & Answers

**Q: Does it come with one or two?**
A: Two :)

**Q: Are these compatible with the Willow Go?**
A: Yes

**Q: Can I use these for the zomee z2?**
A: I don’t own the zomee but I have tried these with several different pumps and these inserts can pretty much fit universally into any 24mm flange.

**Q: I measured for a 17mm flange. According to the sizing chart I would order a 19mm. Is that correct?**
A: That is what I did and ir fit very well. I can use them in my willow go and my momcozy s12 pro!

## Customer Reviews

### ⭐⭐⭐⭐ Best for willow
*by H***A on 29 March 2026*

If you own a willow pump these are the best for it. Do check the size accurately before buying though. These are very soft and fit perfectly with the willow. Cheaping out on these are a bad idea, the originals are much better

### ⭐⭐⭐⭐⭐ Willow Go flange insert
*by T***Y on 23 March 2026*

Insert firs perfect inside the 24mm flange for the Willow Go. Its exactally what I needed for a solid pumping session.

### ⭐⭐⭐⭐⭐ Love
*by A***Z on 1 April 2026*

Love these inserts!!

## Frequently Bought Together

- Willow Breast Pump Sizing Insert, 19mm, 2 Ct, Flange Inserts for Breast Pump, Improves Fit and Comfort for Breast Pumping Moms, Fits in 24mm Willow Breast Pump Flange
- Willow - 360 Breast Pump Flextubes - for Spare Use or Replacement Part for The Willow 360 or 3.0 Wearable, Hands-Free Breast Pump, Breastfeeding Essential for New Moms- 2ct
- Willow - 360 Pump Spill-Proof Breast Milk Bags - 48 Ct - Holds 4 oz. Per Self-Sealing Storage Bag - Compatible with Willow 360 or 3.0 Wearable Hands Free Breast Pump

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---

*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-06-26*