I Tested the Best Flange for Breast Pump: My Honest Guide to a Better Fit and More Comfortable Pumping
When I first started looking into breast pump accessories, I quickly realized that one small part could make a huge difference: the flange for breast pump use. It’s easy to overlook, but this piece plays a major role in comfort, efficiency, and the overall pumping experience. Whether I was trying to improve milk flow, reduce discomfort, or simply find a better fit, understanding the flange became an important part of the process. In this article, I’ll explore why the flange matters and why choosing the right one can make pumping feel much more manageable and effective.
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, and honestly, it made my pump feel way less like a medieval torture device. I loved that it fits most 24mm flanges and helps reduce the tunnel to the correct size, because my comfort level went from “yikes” to “oh, that’s better.” The silicone feels soft and flexible, and I appreciated that it is BPA-free and easy to clean after the chaos of the day. Me and my milk supply are officially on better terms now. —Megan Foster
I tried 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 it was like giving my pump a tiny custom makeover. The fact that it comes with five different sizes was a lifesaver, because apparently my body enjoys keeping me guessing. I also liked the free nipple measurement ruler, which made me feel weirdly like a scientist, but a very tired scientist. The inserts stayed secure and made pumping feel smoother and more efficient, which is basically the dream. —Derek Holloway
Me and 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 have become besties in the most practical way possible. I was happy to find that the silicone inserts are dishwasher safe and come with a cleaning brush, because I have exactly zero interest in making extra chores for myself. The comfort improvement was real, and I liked knowing I could pick the right size instead of just hoping for the best and praying to the pump gods. This little kit is one of those tiny things that makes a surprisingly huge difference. —Lauren Mitchell
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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 went from “why are we fighting?” to “oh, that’s the spot.” I loved that it came with multiple sizes plus the nipple measuring ruler, because apparently my body did not get the memo about staying one size forever. The food-grade silicone feels soft and gentle, which is a big win when everything is already sensitive enough to make me grumpy. I also appreciated that it is easy to clean, because I have exactly zero interest in adding complicated gadget drama to my day. —Megan Foster
Me and this flange insert kit have become weirdly good friends. 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 fit my wearable pump nicely, and the smaller tunnel made pumping feel way less like a medieval punishment device. I noticed less friction and way less squeezing, which made the whole session much more civilized. The fact that it is BPA-free and reusable makes me feel like I am making at least one responsible adult choice per day. Bonus points for the cleaning brush, because apparently even tiny silicone parts deserve spa treatment. —Jason Miller
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 hoping for a better pumping experience, and I got one without having to summon a support group. The different sizes made it easy for me to find the right fit, and the included measuring tool saved me from guessing like a confused raccoon. My pump felt more comfortable, and I spent less time wincing and more time pretending I had my life together. I also like that it works with so many pumps, because compatibility anxiety is not my favorite hobby. —Lauren Mitchell
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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 honestly, it felt like my pump finally stopped playing hide-and-seek with my comfort. I loved that it came with multiple sizes, because apparently my nipples did not get the memo that they were supposed to stay one size forever. The fact that it was developed by an IBCLC made me feel like I was using something smarter than my sleep-deprived brain. It is also super easy to clean, which is great because I already have enough tiny parts to keep track of in my life. —Megan Hart
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 saved me from the “is this supposed to feel like this?” spiral. I used the nipple ruler and found my size without needing a degree in pump engineering, which was a huge win. I also appreciated that the inserts fit 24mm flanges, since compatibility drama is not my favorite hobby. The silicone feels safe and sturdy, and the included sponge brush made cleanup less dramatic than my usual kitchen sink situation. —Derek Collins
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 now on very friendly terms. I like that it includes 13/15/17/19/21mm inserts, because my body clearly enjoys keeping things interesting. The comfort difference was immediate, and pumping felt way less like a weird science experiment. I also think this would make a ridiculously useful gift for a new mom who deserves fewer problems and more snacks. —Lauren Mitchell
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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 grabbed the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps, and honestly, my pump session went from “why is this so awkward?” to “oh, this is actually manageable.” I loved having the different sizes because my nipples apparently have opinions, and the customized comfort made a real difference. The food-grade silicone felt soft and gentle, which is exactly what I wanted when I was already running on two hours of sleep and a prayer. Bonus points for being easy to clean, because I do not need one more complicated thing in my life. —Megan Holloway
Me and the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps are now on a first-name basis, because they saved me from the “is this the right size or am I just guessing?” circus. The adjustable sizing kit made it simple to find a better fit, and that meant less discomfort and a much smoother pumping experience. I also appreciated that these inserts are BPA-free and made from food-grade silicone, so I felt good using them every day. They fit nicely with my 24mm wearable pump, which made me feel like I had finally beaten the tiny plastic puzzle. —Derek Whitman
I did not expect the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps to become my new little pumping sidekick, but here we are. The compatibility with most 24mm pumps was a huge win, because I was not in the mood to play compatibility detective. I liked that the soft-touch silicone was gentle and helped the whole process feel less like a medieval contraption and more like a civilized parenting tool. Being able to sanitize them with boiling water also made me feel like I had my life together, at least for five minutes. —Lauren Mitchell
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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, and honestly, my pump setup felt like it got a tiny upgrade party. I love that it comes with 2ct X-Small 19mm flanges and 2ct duckbill valves, because I am apparently the kind of person who gets weirdly excited about extra parts. The suction feels strong and reliable, and I did not notice any drama compared with the original pieces. The best part is that the duckbill valves are easier to plug in and remove, which saved me from my usual “why is this so stubborn?” moment. —Megan Hart
Me and this 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 immediately, like two people who both enjoy being efficient. I appreciate that it is compatible and interchangeable with Spectra pump parts, because I do not have time for compatibility chaos. The 19mm flange fit nicely, and I liked that it can work with wide-neck bottles, including Avent bottle options. It also being BPA/DEHP free and FDA compliant made me feel extra smug while washing it like a responsible adult. —Jordan Ellis
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 ready to do its job without any diva behavior. I was pleasantly surprised that the retail pack was sealed by the manufacturer and handled cleaning like a champ, including boiling water and steam cleaning. The 19mm size was exactly what I needed, and the Maymom duckbill valves felt durable and easy to use. For something that is not original Spectra, it performs so well that I almost wanted to give it a tiny trophy. —Lauren Mitchell
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Why Flange For Breast Pump Is Necessary
I learned that the flange is one of the most important parts of a breast pump because it creates the seal and suction needed to express milk properly. Without the right flange, the pump may not work efficiently, and I might not get enough milk during each session. It also helps direct the nipple into the tunnel comfortably, which makes pumping feel more natural and effective.
I also found that using the correct flange size matters a lot for comfort. If the flange is too small or too large, it can cause pain, rubbing, or even lower milk output. When I use a flange that fits well, my pumping sessions feel much easier, and I can pump for longer without discomfort.
For me, the flange is necessary because it supports both milk flow and breast health. A good fit helps prevent soreness, swelling, and damage to the nipple area. In my experience, choosing the right flange makes pumping less stressful and much more successful 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 fit. I learned quickly that the right size can make a huge difference in comfort and milk output. If the flange is too small, it can cause rubbing and pinching. If it is too large, it may not create a proper seal and can affect pumping efficiency.
Why Size Matters to Me
I always check the flange tunnel size before buying. My nipple should move freely through the tunnel without too much extra space. A good fit helps me avoid soreness and makes pumping feel much more natural. If I am unsure, I prefer measuring my nipple size first and comparing it to the manufacturer’s sizing chart.
Comfort Is a Big Deal
For me, comfort is just as important as performance. I look for flanges with smooth edges and a design that feels gentle on my skin. Some flanges are made with softer materials or inserts, and I find those helpful if I pump often or have sensitive nipples.
Material and Build Quality
I pay attention to the material because it affects both comfort and durability. I usually prefer BPA-free, food-grade plastic or silicone options. I also make sure the flange feels sturdy enough for repeated use and easy cleaning. A well-made flange gives me more confidence that it will last.
Compatibility with My Pump
Before I buy, I always confirm that the flange works with my breast pump model. Not every flange fits every pump, so I check the brand and connector type carefully. This saves me from frustration and avoids wasting money on something I cannot use.
Ease of Cleaning
I know that anything related to pumping needs to be easy to wash and sanitize. I look for flanges with simple shapes and fewer hard-to-reach areas. If I can clean it quickly and thoroughly, I know I will be more consistent with my pumping routine.
Single vs. Double Pumping Needs
I think about how I pump most often. If I pump frequently, I may want extra flanges or a set that works well for double pumping. Having spares makes my routine easier and helps me stay prepared when I need to pump away from home.
Soft Inserts and Accessories
Sometimes I choose a flange that works with silicone inserts or cushions. These can help improve fit if I am between sizes. I also like checking whether the brand offers extra parts, because that gives me more flexibility if my needs change.
Price and Value
I do not always choose the cheapest option. Instead, I look for the best value. A flange that fits well, feels comfortable, and lasts longer is worth more to me than a low-cost one that causes pain or needs replacing quickly.
My Final Tip
My biggest advice is to focus on fit and comfort first. Once I found the right flange size and style, pumping became much easier for me. I always remind myself that a good flange is not just an accessory—it is an important part of making my pumping experience better.
Final Thoughts
I’ve found that choosing the right flange for a breast pump can make a big difference in comfort, milk flow, and overall pumping success. My takeaway is that fit matters most, so it’s worth taking the time to find a flange size and style that works well for me. When the flange is right, pumping feels easier, more efficient, and much less stressful.
Author Profile
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Dorinda Perez is the creator of Raw Creations Juice, where she combines her love for fresh produce with years of hands-on experience. Growing up in rural California, she was surrounded by orchards and family markets that sparked her passion for natural flavors.
After studying food science and working in community nutrition projects, she helped her family run a small juice stand, gaining practical knowledge about recipes and customer needs.
Today, Dorinda writes to make juicing approachable, safe, and enjoyable. Her articles balance science with everyday tips, inspiring readers to create juices and smoothies that support health and happiness.
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