--- product_id: 612472941 title: "Breast Pump Sizing Insert | 19mm for 15mm-17mm Size | Improve Fit for Willow Wearable Breast Pump Flanges & Containers 24mm Only" brand: "willow" price: "₱3356" currency: PHP in_stock: true reviews_count: 5 category: "Willow" url: https://www.desertcart.ph/products/612472941-breast-pump-sizing-insert-19mm-for-15mm-17mm-size-improve store_origin: PH region: Philippines --- # Precision 19mm sizing insert Flexible, soft silicone material Reusable & dishwasher safe Breast Pump Sizing Insert | 19mm for 15mm-17mm Size | Improve Fit for Willow Wearable Breast Pump Flanges & Containers 24mm Only **Brand:** willow **Price:** ₱3356 **Availability:** ✅ In Stock ## Summary > 🍼 Perfect fit, flawless pump—because your comfort deserves precision. ## Quick Answers - **What is this?** Breast Pump Sizing Insert | 19mm for 15mm-17mm Size | Improve Fit for Willow Wearable Breast Pump Flanges & Containers 24mm Only by willow - **How much does it cost?** ₱3356 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ph](https://www.desertcart.ph/products/612472941-breast-pump-sizing-insert-19mm-for-15mm-17mm-size-improve) ## 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 - • **Durable & Hygienic:** Made from flexible silicone, fully reusable and dishwasher safe for easy maintenance - • **Seamless Integration:** Effortlessly slips into existing Willow pump flanges and containers for a snug fit - • **Pump Anywhere, Anytime:** Enhances comfort so you never miss a moment—discreet, wearable, and spill-proof for on-the-go moms - • **Exclusive Compatibility:** Designed specifically for Willow Wearable Breast Pump Generations 2 & 3, the only fully enclosed, spill-proof pump - • **Tailored Fit for Ultimate Comfort:** Custom 19mm insert ensures perfect seal with 24mm Willow flange for smaller sizes ## Overview The Willow Breast Pump Sizing Insert (19mm) is a flexible silicone accessory designed to improve fit and comfort for moms using the Willow Wearable Breast Pump with smaller flange sizes. It fits into 24mm flanges, is reusable, dishwasher safe, and compatible exclusively with Willow Generations 2 and 3 pumps, enabling spill-proof, discreet pumping 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 Review: Perfect! ## 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 | | Additional Features | Wearable | | Best Sellers Rank | #19,784 in Baby Products ( See Top 100 in Baby Products ) #106 in Breast Pump Parts | | Brand | Willow | | Brand Name | Willow | | Customer Reviews | 4.6 out of 5 stars 712 Reviews | | Included Components | Flange | | Included components | Flange | | Is the item dishwasher safe? | No | | Manufacturer | Willow | | Manufacturer Part Number | SZ1964 | | Material | Silicone | | Material Type | Silicone | | Material Type Free | Lead Free | | Model Number | SZ1964 | | Operation Mode | Manual | | Operation mode | Manual | | Power Source | Battery Powered | | Power source | Battery Powered | | Product Style | Compact | | Size | 19mm | | Special features | Wearable | | UPC | 858298006613 | | Unit Count | 1.0 Count | ## Product Details - **Brand:** Willow - **Material:** Silicone - **Operation mode:** Manual - **Power source:** Battery Powered - **Special features:** Wearable ## Images ![Breast Pump Sizing Insert | 19mm for 15mm-17mm Size | Improve Fit for Willow Wearable Breast Pump Flanges & Containers 24mm Only - Image 1](https://m.media-amazon.com/images/I/31LUxe1lEfL.jpg) ## 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* ### ⭐⭐⭐⭐⭐ Perfect! *by W***N on 1 March 2026* ### ⭐⭐⭐⭐⭐ Willow Go flange insert *by T***Y on 23 March 2026* ## 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 --- ## 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.ph/products/612472941-breast-pump-sizing-insert-19mm-for-15mm-17mm-size-improve](https://www.desertcart.ph/products/612472941-breast-pump-sizing-insert-19mm-for-15mm-17mm-size-improve) --- *Product available on Desertcart Philippines* *Store origin: PH* *Last updated: 2026-04-22*