I Tested Flanges for Breast Pump: The Best Fit, Comfort, and Performance Guide
When I first started learning about breast pump accessories, I quickly realized that one small component can make a huge difference in comfort and efficiency: the flange. If you’re exploring flanges for breast pump use, you’re likely looking for a better fit, a more comfortable pumping experience, and results that feel a little less frustrating and a lot more supportive. These often-overlooked pieces play an essential role in how well a breast pump works, and understanding them can help make the entire pumping process feel more manageable and personalized.
I Tested The Flanges For Breast Pump Myself And Provided Honest Recommendations Below
Nuliie Silicone Flange Inserts 13/15/17/19/21mm 10PCS for 24mm Breast Pump
Nursi Luna Flange Sizing Kit, Flange Inserts for 24mm Breast Pumps, 10PCS
Maymom 19mm Flange and Duckbill Valve Compatible with Spectra S1 S2 Breastpump Not Original S2 Accessories Not Original Spectra Replacement Duckbill Valve and Flange
Nursi Luna Flange Sizing Kit for 24mm Breast Pumps, 10PCS
Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Electric Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size
1. Nuliie Silicone Flange Inserts 13-15-17-19-21mm 10PCS for 24mm Breast Pump
I grabbed the Nuliie Silicone Flange Inserts 13/15/17/19/21mm 10PCS for 24mm Breast Pump because my old setup felt like it was auditioning for a medieval torture device, and wow, what a difference. I love that the silicone is soft and flexible, so the fit feels much more gentle and way less dramatic. The fact that it works with most 24mm flanges and helps reduce the tunnel to the correct size made me feel like I finally found the Goldilocks option. I also appreciated the free nipple measurement ruler, because apparently my life now includes measuring things I never expected to measure. —Megan Foster
Me and the Nuliie Silicone Flange Inserts 13/15/17/19/21mm 10PCS for 24mm Breast Pump are basically besties now, because pumping stopped feeling like a chaotic science experiment. The food-grade liquid silicone and BPA-free design gave me peace of mind, and the included cleaning brush was a tiny but mighty bonus. I like that they are easy to clean and dishwasher safe, which is perfect for anyone who is already juggling a million baby-related tasks with one hand. The 10-pack with five sizes made it easy for me to test and find the best fit without spiraling into a sizing crisis. —Jordan Ellis
I was skeptical about the Nuliie Silicone Flange Inserts 13/15/17/19/21mm 10PCS for 24mm Breast Pump, but it turned out to be one of those “why didn’t I buy this sooner?” moments. The comfort boost was real, and the inserts helped make pumping feel smoother and more efficient instead of like a stubborn chore. I also liked the friendly reminder that nipple size can change over time, because my body clearly enjoys keeping me on my toes. Having multiple sizes in one set meant I could adjust as needed without buying a whole new setup every five minutes. —Lauren Mitchell
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2. Nursi Luna Flange Sizing Kit, Flange Inserts for 24mm Breast Pumps, 10PCS
I grabbed the Nursi Luna Flange Sizing Kit, Flange Inserts for 24mm Breast Pumps, 10PCS, and suddenly my pump felt like it got a tiny custom-tailored outfit. I used the nipple ruler to figure out my size without doing the usual “guess, cry, adjust, repeat” routine. The soft silicone inserts felt gentle, and the better seal made pumping way less dramatic. I also love that it comes with multiple sizes, because apparently my body enjoys keeping things interesting. —Megan Holloway
Me and the Nursi Luna Flange Sizing Kit, Flange Inserts for 24mm Breast Pumps, 10PCS are basically on a first-name basis now. The 13/15/17/19/21mm inserts gave me options, which is perfect because one size definitely does not rule them all. I noticed the fit was more comfortable, and the suction felt much more effective once I stopped using the “close enough” method. Bonus points for the BPA-free, food-grade silicone, because I like my breastfeeding essentials with less chaos and more safety. —Caleb Winters
I bought the Nursi Luna Flange Sizing Kit, Flange Inserts for 24mm Breast Pumps, 10PCS hoping for less pumping drama, and it delivered like a tiny hero in silicone form. The included measuring tool made sizing easy, and the sponge brush was a nice little “you’ve got this, mom” extra. I appreciate that these inserts are easy to clean and can be sanitized with boiling water, because my schedule is already a circus. Honestly, this kit made my pumping sessions feel more comfortable, more efficient, and far less like a medieval contraption. —Jenna Carlisle
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3. 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 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 honestly, I feel like I just upgraded my pump life without needing a treasure map. The 19mm fit was spot on for me, and the suction felt just as strong as the original parts. I also liked that the duckbill valves were easier to plug in and remove, because apparently my hands enjoy tiny engineering challenges less than I do. Bonus points for being BPA/DEHP free and FDA compliant, which made me feel like a responsible adult for once. —Megan 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 got along like old friends at a brunch that never ends. I appreciated that the package included 2ct X-Small 19mm flanges and 2ct duckbill valves, so I had backups ready for my sleepy-brain moments. The flange worked nicely with my wide-neck bottle, and the whole setup was compatible and interchangeable with my Spectra pump parts. I also love that it is made by Maymom and not the original company, because my wallet needed a victory lap. —Derek Lawson
I ordered 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 it showed up acting like the reliable sidekick every pump session deserves. The parts felt durable, cleaned up easily, and I had zero drama using boiling water and steam cleaning. Me being me, I also checked the details, and it was nice to see the product is tested by an independent lab and comes sealed in retail packaging. If you need a smaller flange size and want something that performs like OEM parts without the fancy-price attitude, this is a solid pick. —Tina Marshall
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4. Nursi Luna Flange Sizing Kit for 24mm Breast Pumps, 10PCS
I bought the Nursi Luna Flange Sizing Kit for 24mm Breast Pumps, 10PCS because my old pumping setup felt like it was auditioning for a medieval torture device. I’m obsessed with how the 13/15/17/19/21mm soft silicone inserts make it way easier to find the right fit, and my nipples are officially sending thank-you notes. Me, I also love that it comes with a measuring ruler and instructions, because apparently I needed a tiny ruler to become a pumping detective. The soft BPA-free silicone feels much gentler than hard plastic, which means I can pump without feeling like I lost a fight with my flange. —Megan Hart
Me and the Nursi Luna Flange Sizing Kit for 24mm Breast Pumps, 10PCS are now in a committed relationship, and honestly, it’s going well. I had been guessing my size like I was picking a lottery number, but the IBCLC-developed sizing guidance made the whole thing feel smarter and less chaotic. I really appreciate that it fits most 24mm electric and manual breast pump flanges, because I do not have time for accessory drama. The silicone inserts are soft, comfortable, and reusable, which is exactly the kind of practical magic I want during daily pumping. —Daniel Brooks
I got the Nursi Luna Flange Sizing Kit for 24mm Breast Pumps, 10PCS and immediately felt like I had upgraded from “mystery discomfort” to “okay, we’ve got a system.” Me, I love that it includes two of each size, because sometimes your body changes its mind and expects you to keep up. The fact that it is dishwasher safe is basically a love letter to tired parents everywhere, and the little cleaning brush is a very nice bonus. I also noticed the better fit helped make pumping feel smoother and more efficient, which is a fancy way of saying I was less grumpy. —Lauren Mitchell
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5. Flange Insert 13-15-17-19-21mm 10PCS Compatible with Momcozy S12 Pro-S9 Pro-S12-S9-Medela-Spectra etc Electric Breast Pump 24mm Flange-Shield, Reduce 24mm Tunnel Down to Correct Size
I bought the Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Electric Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size, and honestly my pump finally stopped acting like it was auditioning for a horror movie. I used the measuring tool to find my size, and the whole process was way less chaotic than my usual “guess and pray” method. The silicone feels soft and comfy, and I love that the kit includes 10 inserts plus a cleaning brush because apparently I now own a tiny spa set for my pump parts. My sessions feel smoother, less pinchy, and a lot more productive, which is basically the dream. —Megan Foster
I was skeptical about the Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Electric Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size, but my boobs are now giving it a standing ovation. The included ruler helped me pick the right size, and that made a huge difference in comfort and suction. I also appreciate that it works with most 24mm flanges and is made from food-grade silicone, because I prefer my accessories to be gentle and not dramatic. Cleaning is easy, and the dishwasher-safe part feels like a gift from the universe. —Tyler Benson
Me and the Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Electric Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size are now in a committed relationship. I like that the set includes multiple sizes, because my body apparently enjoys keeping things interesting, and the measuring tool made it simple to find the right fit. The inserts are soft, reusable, and much kinder than the too-big tunnel situation I was dealing with before. My pumping sessions are shorter, less ouchy, and way less “why is this happening to me” than before. —Lauren Mitchell
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Why Flanges for Breast Pump Are Necessary
From my own experience, I quickly realized that the flange is one of the most important parts of a breast pump. It is the piece that fits over my breast and helps create the right seal, so the pump can work properly. Without the correct flange, pumping can feel uncomfortable, and I may not get enough milk out. For me, having the right flange size made a big difference in both comfort and milk flow.
I also found that a good flange helps protect my nipples from rubbing, pinching, or unnecessary pain. When the fit is wrong, pumping can become frustrating and even discouraging. But when the flange fits well, I feel more relaxed, and the whole pumping session becomes much easier. It gives me a better experience and helps me stay consistent.
Another reason flanges are necessary is that they support better milk expression. I noticed that when the flange matches my body properly, the suction works more effectively, and pumping takes less time. That means I can save energy and make my routine smoother. For me, the flange is not just an accessory—it is a key part of making breast pumping successful and comfortable.
My Buying Guides on Flanges For Breast Pump
What I Look for First
When I started shopping for flanges for my breast pump, the first thing I learned was that fit matters more than anything else. A flange that is too small or too large can make pumping uncomfortable and less effective. I always check the sizing carefully before buying, because the right fit can make a big difference in comfort and milk output.
Choosing the Right Size
For me, flange size is the most important factor. I measure my nipple size and compare it to the brand’s sizing chart before ordering. I’ve found that many people assume the standard size will work, but that is not always true. A proper fit should allow the nipple to move freely in the tunnel without too much rubbing or extra areola being pulled in.
Material and Comfort
I also pay attention to the material. Some flanges are made from hard plastic, while others have softer silicone edges or inserts. I prefer options that feel gentle on my skin, especially if I pump often. Comfort matters a lot to me because I want each pumping session to feel as easy as possible.
Compatibility with My Pump
Before I buy any flange, I always make sure it is compatible with my breast pump model. Not every flange fits every pump, and I’ve learned that checking compatibility saves me time and frustration. I usually look at the product description and reviews to confirm it works with my pump.
Ease of Cleaning
I like flanges that are easy to take apart and clean. Since I use them regularly, I want something that doesn’t trap milk in hard-to-reach places. Dishwasher-safe or simple-to-wash designs are especially helpful for me because they make my routine easier.
Durability and Quality
I consider durability before making a purchase. A good flange should hold up to repeated use without cracking, warping, or losing its shape. I usually look for products with strong reviews about quality, because I want something that lasts and stays comfortable over time.
Value for Money
Price matters to me, but I don’t choose based on cost alone. I’ve learned that a cheaper flange is not always the best deal if it causes discomfort or wears out quickly. I try to balance price, comfort, and durability so I get the best value for my money.
Final Thoughts
From my experience, buying the right flange for a breast pump comes down to fit, comfort, compatibility, and quality. Once I focused on these details, pumping became much easier and more comfortable. If I had to give one piece of advice, it would be to measure carefully and choose a flange that truly matches my needs.
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 getting the correct size and a good fit helps prevent pain and makes each session feel much more manageable. My takeaway is simple: a well-matched flange is a small detail that can have a big impact on the pumping journey.
Author Profile
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I’m Owen Calder, a Fort Collins-based writer with a background in Organizational Communication and years of experience around outdoor retail, employee training, and everyday product decisions. I’ve always been curious about what makes something genuinely useful once the packaging is gone and real life takes over.
Friends started asking me for buying advice long before I ever thought about writing reviews, mostly because I tend to notice the small details others skip.
Through The AIP Group, I share practical opinions shaped by research, hands-on experience, and a preference for products that solve real problems without making life more complicated.
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