--- product_id: 193836008 title: "21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve" brand: "maymom" price: "$45.34" currency: USD in_stock: true reviews_count: 13 category: "Maymom" url: https://www.desertcart.us/products/193836008-21mm-flange-and-duckbill-valve-compatible-with-spectra-s1-s2 store_origin: US region: United States of America --- # 21mm precision flange size Compatible with Spectra S1, S2, S1Plus BPA/DEHP free & FDA compliant 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve **Brand:** maymom **Price:** $45.34 **Availability:** ✅ In Stock ## Summary > 🔧 Upgrade your pump game with Maymom precision parts—because your flow deserves the best! ## Quick Answers - **What is this?** 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve by maymom - **How much does it cost?** $45.34 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/193836008-21mm-flange-and-duckbill-valve-compatible-with-spectra-s1-s2) ## Best For - maymom enthusiasts ## Why This Product - Trusted maymom brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Plug & Play Design:** Duckbill valves designed for easy installation and removal, saving you time and hassle during busy days. - • **Wide Compatibility:** Works flawlessly with Spectra wide-neck, Avant, and Maymom bottles—flexibility that fits your lifestyle. - • **Effortless Maintenance:** Dishwasher-safe top rack, steam clean, boil, or microwave-sterilize with confidence—hygiene made simple. - • **Perfect Fit, Zero Guesswork:** Engineered for seamless compatibility with Spectra S1, S2, and S1Plus pumps to keep your routine flawless. - • **Durability Meets Convenience:** Made from premium BPA/DEHP-free materials, these parts withstand repeated cleaning without losing integrity. ## Overview Maymom’s 21mm flange and duckbill valve replacement set offers a high-quality, BPA/DEHP-free alternative compatible with Spectra S1, S2, and S1Plus breast pumps. Designed for durability and ease of use, these parts maintain OEM-level suction performance and fit a variety of wide-neck bottles. Independently lab-tested and FDA compliant, they ensure safe, hygienic pumping with convenient cleaning options. ## Description Maymom One-piece Flange Visit the Store Maymom One-piece Flange Visit the Store Maymom Detachable Shield Visit the Store Maymom Detachable Shield Maymom Base Connector Visit the Store Maymom Base Connector Maymom Flange Insert Visit the Store Maymom Flange Insert Maymom Duckbill Valve Visit the Store Maymom Duckbill Valve Maymom Storage/Feeding Bottle Visit the Store Maymom Storage/Feeding Bottle Maymom Bottle Caps Visit the Store Maymom Bottle Caps Maymom Storage Bag Adapter Visit the Store Maymom Storage Bag Adapter Maymom Bottle Converter Visit the Store Maymom Bottle Converter Maymom Tubing Visit the Store Maymom Tubing Backflow Protector & Diaphragm Visit the Store Backflow Protector & Diaphragm Other Products Visit the Store Other Products Maymom cares for each mom Maymom always cares about mothers' needs on the path of breastfeeding. For years, we hear mothers' voice for customized, comfortable and easy-to-use tools. Maymom makes a wide range of aftermarket pump parts including flange, tubing, duckbill valve, backflow protector, collection bottle, milk storage bag adapter, and various kinds of adapters to bridge different systems of name brand breastpumps. Maymom cares for each mom Maymom always cares about mothers' needs on the path of breastfeeding. For years, we hear mothers' voice for customized, comfortable and easy-to-use tools. Maymom makes a wide range of aftermarket pump parts including flange, tubing, duckbill valve, backflow protector, collection bottle, milk storage bag adapter, and various kinds of adapters to bridge different systems of name brand breastpumps. Review: Best replacement parts for my Spectra S2 - These replacement parts for my Spectra S2 were exactly what I needed! The set comes with clear instructions and images, which made swapping everything out super simple, even for someone like me who usually finds pump parts confusing. I especially appreciated the QR codes included; they linked directly to step-by-step instructions and even to individual replacement parts if I ever need to reorder just one piece. The parts themselves feel durable and well-made, and they fit my S2 perfectly without any issues. Everything works smoothly and has held up well after multiple uses and washes. It’s such a relief to have a compatible, high-quality option that makes pumping easier and less stressful. Highly recommend for any Spectra S2 user who wants reliable replacement parts without the guesswork! Review: Works great! - Super happy. Fit well. Wash and wear well. Function as they should. No complaints. ## Features - CONTENTS: 2ct Small 21mm flanges and 2ct duckbill valves compatible with Spectra S2, Spectra S1 and Spectra S1Plus breastpump. Made by Maymom. Not Original Spectra Flanges, Spectra Duckbill Valve. Can use Maymom flange for Spectra S2 pump parts or Maymom valve for Spectra valve replacement. Made by Maymom, not by original spectra company. Maymom is not affiliated with Uzinmedicare, the trademark owner of spectra. - COMPATIBLE AND INTERCHANGEABLE with Spectra pump parts. Maymom pump parts perform the same suction power as OEM parts, Spectra S2 pump parts, Spectra S1Plus accessories. - MAYMOM FLANGE can work with Spectra wide-neck bottle (wide-mouth bottle), Avant bottle, and Maymom widemouth bottle. Available Flange sizes:13mm, 15mm, 17mm, 19mm, 21mm, 24mm, 25mm, 27mm, 28mm, 29mm, 30mm, 32mm. - MAYMOM DUCKBILL VALVES features "easier to plug in and remove", "durable quality" and "color options" - BPA/DEHP FREE. FDA compliant for food contacts. Tested by independent lab. Test report online available for reference. Products in retail pack sealed by manufacturer. No problem with dishwasher top rack, water steam cleaning, boiling water or microwave-steam bags. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0863NBHRX | | Additional Features | Closed System | | Best Sellers Rank | #1,934 in Baby ( See Top 100 in Baby ) #93 in Breastfeeding Supplies | | Brand | Maymom | | Brand Name | Maymom | | Color | White Valve | | Customer Reviews | 4.6 out of 5 stars 5,960 Reviews | | Included Components | Breast Flange, Valve | | Is the item dishwasher safe? | No | | Item Weight | 0.08 Kilograms | | Manufacturer | Maymom | | Manufacturer Part Number | ca_S012W-FxxDx2 | | Material | Plastic, Silicone | | Material Type | Plastic, Silicone | | Model Number | S012W-FxxDx2 | | Product Style | Flange 21mm + Valves | | Size | 21 mm Flanges | | Special Feature | Closed System | | Unit Count | 1.0 Count | ## Product Details - **Brand:** Maymom - **Color:** White Valve - **Included Components:** Breast Flange, Valve - **Material:** Plastic, Silicone - **Special Feature:** Closed System ## Images ![21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve - Image 1](https://m.media-amazon.com/images/I/81wbohX86oL.jpg) ![21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve - Image 2](https://m.media-amazon.com/images/I/71VFo-PFUGL.jpg) ![21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve - Image 3](https://m.media-amazon.com/images/I/81qegQLudqL.jpg) ![21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve - Image 4](https://m.media-amazon.com/images/I/71Dx+IX9kPL.jpg) ![21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve - Image 5](https://m.media-amazon.com/images/I/51OzZ6Hps7L.jpg) ## Available Options This product comes in different **Pattern, Color** options. ## Questions & Answers **Q: will this work with bellababy?** A: no. for bellabay, please buy from the following https://www.amazon.com/Maymom-Compatible-Bellababy-Double-Electric/dp/B09W2KRSC5/ref=sr_1_2?crid=23GCK9QCNBTGZ&keywords=maymom%2Bbellababy&qid=1676120494&sprefix=maymom%2Bbella%2Caps%2C298&sr=8-2&th=1 **Q: Did anyone have trouble and feel like these ran big?** A: Yes I definitely felt these ran big as compared to standard spectra. It doesn’t make sense but 19mm was too big when it was the right size in spectra **Q: I used mine before realizing it’s the wrong flange size, should I still return them?** A: I did the same thing. I just brought flange inserts that were my nipple size and just pushed it in for the correct sizing. But you can if you want. **Q: Does this flange work with the Kiinde system?** A: Yes if you have the Kiinde adapters ## Customer Reviews ### ⭐⭐⭐⭐⭐ Best replacement parts for my Spectra S2 *by C***R on August 29, 2025* These replacement parts for my Spectra S2 were exactly what I needed! The set comes with clear instructions and images, which made swapping everything out super simple, even for someone like me who usually finds pump parts confusing. I especially appreciated the QR codes included; they linked directly to step-by-step instructions and even to individual replacement parts if I ever need to reorder just one piece. The parts themselves feel durable and well-made, and they fit my S2 perfectly without any issues. Everything works smoothly and has held up well after multiple uses and washes. It’s such a relief to have a compatible, high-quality option that makes pumping easier and less stressful. Highly recommend for any Spectra S2 user who wants reliable replacement parts without the guesswork! ### ⭐⭐⭐⭐⭐ Works great! *by H***N on March 17, 2026* Super happy. Fit well. Wash and wear well. Function as they should. No complaints. ### ⭐⭐⭐⭐⭐ Life saver *by K***Z on January 24, 2026* As a pumping only mama, and an overproducer, I have absolutely nothing negative to say about these. Compatible with my spectra gold and a great fit! Love that maymom has the in between sizes. Life saver if you do not want to use the silicone flange inserts. ## Frequently Bought Together - Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 Spectra S2 Spectra 9 Plus Not Original Spectra 20mm Replace Pump Parts Spectra Flange Spectra Duckbill Valve - Spectra - Wide Neck Baby Bottles - Compatible with Spectra Breast Milk Pump Flanges (Pack of 2) - Momcozy Hands Free Pumping Bra, Adjustable Breast-Pumps Holding and Nursing Bra, Pumping & Nursing Bra in One --- ## 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/193836008-21mm-flange-and-duckbill-valve-compatible-with-spectra-s1-s2](https://www.desertcart.us/products/193836008-21mm-flange-and-duckbill-valve-compatible-with-spectra-s1-s2) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-21*