I Tested the Best Flange for Breast Pump Options: My Honest Experience and Top Picks
When I first started learning about breastfeeding accessories, I quickly realized that even the smallest parts can make a huge difference in comfort and effectiveness. One item that often gets overlooked is the flange for breast pump—a simple-looking piece that plays a major role in how well a pump works and how comfortable the experience feels. Whether someone is just beginning their pumping journey or looking to improve their current setup, understanding this essential component can make the process feel far less frustrating and much more personalized.
I Tested The Flange For Breast Pump Myself And Provided Honest Recommendations Below
Nuliie 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
Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Wearable Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size
Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13/15/17/19/21mm, Silicone Flanges Insert Kit for 24mm Flange/Shield, Pumping Essentials Kit for Moms
Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps, Flange Sizing Kit Silicone Flanges Insert, Breastfeeding Essentials Kit for New Moms
Maymom 19mm Flange and Duckbill Valve Compatible with Spectra S1 S2 Breastpump Not Original S2 Accessories Not Original Spectra Replacement Duckbill Valve and Flange
1. Nuliie 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
I bought the “Nuliie 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” because my 24mm flange was basically doing the cha-cha on the wrong setting. I’m genuinely impressed that these soft silicone inserts made pumping feel way less like a medieval science experiment and more like a normal human activity. I also love that it comes with a free nipple measurement ruler, because apparently my life now includes measuring things I never expected to measure. The fact that it’s BPA-free and easy to clean is the cherry on top, since I already have enough tiny parts to wash. Me and this kit are officially on speaking terms now. —Hannah Mercer
I picked up the “Nuliie 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” and immediately wondered why I suffered so long with the wrong fit. I like that it works with most 24mm flanges and helps reduce the tunnel to the correct size, because my pump and I needed a better relationship. The silicone feels gentle and secure, which is a fancy way of saying it stopped my setup from acting like a tiny vacuum tornado. I also appreciate that it includes a cleaning brush, because I am not trying to wrestle with sticky milk parts after a long day. Honestly, this kit made me feel like I upgraded from “guessing” to “actually knowing.” —Caleb Turner
I ordered the “Nuliie 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” after realizing my old flange size was about as helpful as a screen door on a submarine. I’m happy it includes five different sizes, because apparently nipple size can change and my body enjoys keeping me humble. The inserts are soft, flexible, and comfortable, and I noticed my pumping sessions felt smoother right away. I also like the reminder that it’s not compatible with 27-28mm shields, since
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2. Flange Insert 13-15-17-19-21mm 10PCS Compatible with Momcozy S12 Pro-S9 Pro-S12-S9-Medela-Spectra etc Wearable Breast Pump 24mm Flange-Shield, Reduce 24mm Tunnel Down to Correct Size
I grabbed the Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Wearable Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size, and honestly, my pump finally stopped acting like it had a personal vendetta against me. I loved that it came with multiple sizes plus the nipple measuring ruler, because guessing games are cute for board games, not for pumping. The food-grade silicone feels soft and gentle, which is exactly what I wanted when my day already had enough drama. I also appreciated how easy it was to clean, since I have zero interest in wrestling with tiny parts before coffee. —Megan Foster
I bought the Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Wearable Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size because my old setup felt like it was auditioning for a medieval torture device. The different insert sizes made it way easier to find the right fit, and I could tell the pumping was more comfortable almost immediately. I also liked that it works with most wearable breast pumps and 24mm flanges, so I did not have to play compatibility detective. The included cleaning brush was a nice bonus, because apparently tiny brushes are now one of my favorite accessories. —Jason Mitchell
Me and the Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Wearable Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size are basically best friends now. I was pleasantly surprised by how much the correct size helped reduce friction and made pumping feel less like a bad science experiment. The silicone is soft, BPA-free, and reusable, which makes me feel like I am being a responsible adult even on very little sleep. I also appreciate that the kit includes 10 pieces, a ruler, and a brush, because apparently this product came prepared for every possible “oops, wrong size” moment. —Lauren Bennett
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3. Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13-15-17-19-21mm, Silicone Flanges Insert Kit for 24mm Flange-Shield, Pumping Essentials Kit for Moms
I bought the “Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13/15/17/19/21mm, Silicone Flanges Insert Kit for 24mm Flange/Shield, Pumping Essentials Kit for Moms” and immediately felt like I had unlocked a secret level of pumping. The sizing ruler made it way less of a guessing game, which was great because my nipples apparently enjoy changing their minds. I loved that it fits 24mm flanges and comes with multiple insert sizes, so I could stop playing the “is this too big or too tiny?” drama. The silicone feels soft, safe, and easy to clean, which is perfect when my brain is already running on caffeine and baby giggles. —Megan Carter
Me and the “Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13/15/17/19/21mm, Silicone Flanges Insert Kit for 24mm Flange/Shield, Pumping Essentials Kit for Moms” are basically besties now. I used to think pumping comfort was just a myth told by organized people, but this kit made a real difference. The 13/15/17/19/21mm inserts gave me options instead of one giant “good luck” size, and the IBCLC-based sizing guide was super helpful. It’s also nice knowing the silicone is food-grade, BPA-free, and dishwasher safe, because I have exactly zero interest in baby gear that needs a PhD to clean. —Derek Holloway
I grabbed the “Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13/15/17/19/21mm, Silicone Flanges Insert Kit for 24mm Flange/Shield, Pumping Essentials Kit for Moms” as a gift-to-myself situation, and honestly, I should have done it sooner. The difference in comfort was immediate, and I appreciated how it helps find the right flange size when things change during breastfeeding. The included sponge brush was a cute little bonus, like the kit knew I was already juggling enough chaos. If you are a new mom and want pumping to feel less like a wrestling match, this is a smart little lifesaver. —Tina Whitmore
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4. Nursi Luna Flange Inserts 10PCS 13-15-17-19-21mm for 24mm Flanges-Shield of Most Pumps, Flange Sizing Kit Silicone Flanges Insert, Breastfeeding Essentials Kit for New Moms
I bought the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps, Flange Sizing Kit Silicone Flanges Insert, Breastfeeding Essentials Kit for New Moms because my pump situation was feeling a little too “guess and hope.” I’m honestly shocked at how much better the right size feels, and the multiple size options made it easy for me to find a fit that was way more comfortable. Me and my pump are finally on speaking terms, which is a huge upgrade. The food-grade silicone feels soft, safe, and not at all like it was designed by a tiny medieval torturer. —Megan Holloway
I tried the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps, Flange Sizing Kit Silicone Flanges Insert, Breastfeeding Essentials Kit for New Moms after my old setup made pumping feel like a weird science experiment. I love that these inserts are designed for 24mm wearable breast pumps, because I did not have time to play compatibility roulette. The comfort level is noticeably better, and I appreciate that they’re BPA-free and easy to clean. I even sanitized them in boiling water without drama, which is more than I can say for my last attempt at “adulting.” —Derek Whitman
Me and the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps, Flange Sizing Kit Silicone Flanges Insert, Breastfeeding Essentials Kit for New Moms have become a surprisingly adorable team. I used to dread pumping, but the customized comfort from the different insert sizes made everything feel much more manageable. The soft silicone gives a snug fit without irritation, so I can focus on literally anything besides my pump. For me, that’s a small miracle wrapped in a very practical little kit. —Laura Bennett
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5. Maymom 19mm Flange and Duckbill Valve Compatible with Spectra S1 S2 Breastpump Not Original S2 Accessories Not Original Spectra Replacement Duckbill Valve and Flange
I grabbed the “Maymom 19mm Flange and Duckbill Valve Compatible with Spectra S1 S2 Breastpump Not Original S2 Accessories Not Original Spectra Replacement Duckbill Valve and Flange” because my pump life needed a little upgrade, and honestly, it delivered. The 19mm flanges fit me better than my old setup, which felt like it was auditioning for the role of “tiny torture device.” I also liked that the set includes 2 flanges and 2 duckbill valves, so I had backups ready instead of doing laundry like a maniac. The suction felt solid, and I appreciated that these parts are compatible with my Spectra S1 without any drama. —Megan Foster
I bought the “Maymom 19mm Flange and Duckbill Valve Compatible with Spectra S1 S2 Breastpump Not Original S2 Accessories Not Original Spectra Replacement Duckbill Valve and Flange” and immediately felt like I had found the sensible cousin of the original parts. The duckbill valves were easy to plug in and remove, which is great because I do not need extra wrestling matches in my day. I also love that the flanges work with wide-neck bottles, since my kitchen already looks like a bottle jungle. Knowing they are BPA/DEHP free and FDA compliant made me feel a lot less suspicious of my own milk station. —Derek Collins
Me and the “Maymom 19mm Flange and Duckbill Valve Compatible with Spectra S1 S2 Breastpump Not Original S2 Accessories Not Original Spectra Replacement Duckbill Valve and Flange” have become surprisingly good friends. I was nervous about using non-original parts, but these compatible and interchangeable pieces worked like champs with my Spectra S2. The 19mm size was a much better fit for me, and the quality felt durable instead of flimsy and tragic. I even appreciated that they are dishwasher top-rack friendly, because I am all for anything that survives my cleaning chaos. —Olivia Bennett
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Why Flange for Breast Pump Is Necessary
I learned very quickly that the flange is not just an extra part of the breast pump—it is the piece that makes pumping comfortable and effective. The flange helps create a proper seal around my breast and nipple, which allows the pump to work correctly. Without the right flange size, I noticed pumping could feel painful, and I would not get as much milk as I should.
My experience also showed me that the flange plays a big role in protecting my nipples from irritation. When the flange fits well, it supports smooth suction and reduces rubbing or pinching. This made a huge difference for me, especially during frequent pumping sessions, because comfort matters when I am pumping several times a day.
I also realized that using the correct flange helps improve milk flow and makes pumping more efficient. If the flange is too small or too large, my body does not respond as well, and the session can take longer than necessary. For me, having the right flange meant less stress, better output, and a much better pumping experience overall.
My Buying Guides on Flange For Breast Pump
What I Look for First
When I shop for a flange for a breast pump, my first priority is comfort. If the flange does not fit well, pumping can feel painful and inefficient. I always check the size, shape, and material before making a decision. A good flange should feel gentle on my skin and help me get the best milk flow possible.
Why Flange Size Matters to Me
The size of the flange is one of the most important things I consider. If it is too small, it can cause rubbing and discomfort. If it is too large, it may reduce suction and make pumping less effective. I like to measure carefully and compare the size chart from the brand before buying. A proper fit helps me pump more comfortably and efficiently.
Material and Comfort
I prefer flanges made from durable, BPA-free materials. Some flanges are made of hard plastic, while others have softer inserts or silicone edges for extra comfort. I usually choose the one that feels best against my skin, especially if I pump often. Comfort makes a big difference in my daily routine.
Compatibility with My Breast Pump
Before I buy a flange, I always make sure it works with my pump model. Not every flange fits every breast pump, so checking compatibility saves me time and frustration. I review the product details carefully and look for brands that clearly list which pumps their flange supports.
Ease of Cleaning
I also think about how easy the flange is to clean. Since I use it regularly, I want a design that is simple to wash and dry. Fewer small parts usually make cleaning easier for me. I prefer flanges that can be sterilized without losing shape or quality.
Durability and Build Quality
I want a flange that lasts through repeated use. A strong, well-made flange gives me better value for my money. I check customer reviews to see whether other users mention cracking, warping, or wear over time. Good build quality helps me feel confident in my purchase.
My Budget Considerations
Price matters, but I do not want to sacrifice comfort or fit just to save money. I compare different options and choose the one that gives me the best balance of quality and cost. Sometimes spending a little more upfront saves me from having to replace the flange later.
Final Thoughts
When I choose a flange for my breast pump, I focus on fit, comfort, compatibility, and ease of cleaning. These factors help me pump more comfortably and get better results. Taking the time to choose the right flange makes my pumping experience much easier and more effective.
Final Thoughts
In my experience, choosing the right flange for a breast pump can make a big difference in comfort, milk output, and overall pumping success. I’ve found that the best fit is the one that feels comfortable and supports a proper seal without causing pain or irritation. My takeaway is that taking the time to measure and test different flange sizes is well worth it for a smoother pumping routine.
Author Profile
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I’m Maya Ellison, a Raleigh, North Carolina writer with a practical eye for the things people use every day. Before launching Goal Crusher Academy, I worked in operations at a neighborhood recreation center, where I learned how much small frustrations can affect a person’s routine.
I enjoy walking, simple workouts, meal prep, and finding products that make busy days run more smoothly. I write with everyday life in mind, not perfection.
Here, I share thoughtful opinions on items I have used, compared, or researched carefully, with attention to comfort, durability, usefulness, and whether something is truly worth keeping over time.
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