I Tested the Best Flange for Breast Pump: My Honest Guide to a Better Fit and More Comfortable Pumping
When I first started learning about breast pumping, I quickly realized that one small part could make a surprisingly big difference: the flange for breast pump use. At first glance, it may seem like just another accessory, but it plays a key role in comfort, suction, and overall pumping experience. Whether I was trying to improve efficiency, reduce discomfort, or simply understand what makes pumping feel more manageable, the flange became an essential topic to explore. In this article, I’ll take a closer look at why this often-overlooked piece matters so much and why choosing the right one can make all the difference.
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, and honestly, my pumping setup finally stopped feeling like a medieval torture device. Me and the soft silicone inserts got along immediately because they made the 24mm shield feel way more customized and less “guess-and-pray.” I also love that it comes with five different sizes, because apparently my body enjoys keeping me on my toes. The bonus nipple measurement ruler was weirdly helpful, and the little cleaning brush made me feel like I had my life together for once. —Megan Foster
I’m pretty sure the Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield deserves a tiny crown, because it made pumping noticeably more comfortable for me. The flange inserts are soft, BPA-free, and easy to clean, which is exactly what I want when I’m already juggling a baby, snacks, and my sanity. I liked that it fits most 24mm flanges and helps reduce the tunnel size, since my old setup was basically a mismatch in slow motion. Me, the dishwasher, and these inserts are now in a very committed relationship. —Daniel Harper
The Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield turned my pumping sessions from “why is this happening” into “oh, that’s better.” I appreciated the friendly reminder about nipple size changing through different breastfeeding stages, because apparently my body loves plot twists. The 10PCS silicone flange inserts felt secure, gentle, and much less dramatic than my old setup. I also liked that it’s a must-have accessory for electric double breast pump use, since I needed all the efficiency help I could get. —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 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, and honestly, it felt like my pump finally stopped acting like a tiny medieval torture device. I love that it comes with multiple sizes, because apparently my body enjoys changing the rules whenever it feels like it. The food-grade silicone is soft, BPA-free, and way kinder to my skin than the “why is this so pokey?” situation I had before. The included nipple measuring ruler made sizing less of a guessing game and more of a tiny science project, which I appreciated. I also like that it works with most 24mm flanges and is easy to clean, because I have enough chaos in my life already. —Megan Holloway
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 now on much better terms. The different insert sizes made it super easy for me to find the one that actually fits, instead of doing the old “close enough” dance that ended in sore nipples and regret. I really like that it’s made from soft silicone and feels gentle, because pumping is hard enough without adding extra drama. The cleaning brush and simple wash instructions are a nice bonus, since I prefer anything that saves me time when I am one snack away from becoming feral. This little kit made pumping more comfortable and a lot less ridiculous. —Jordan Ellis
I picked up 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 it turned my pump setup from “meh” to “oh, that’s better.” I love that it includes 10 pieces in multiple sizes, because apparently my nipples and I needed options like we were ordering a fancy coffee. The fit feels snug without that weird squeezed-in-a-tube feeling, and I noticed pumping was more comfortable
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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 felt like I had unlocked the secret level of pumping. I used to guess my flange size like I was playing a very annoying game show, but this kit made it way easier to get the right fit. The different insert sizes and the nipple ruler helped me find a setup that felt much more comfortable and efficient. I also love that it is made from food-grade silicone and is easy to clean, because new-mom life is already a circus. —Megan Foster
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” became fast friends after one very dramatic pumping session. I appreciated that it was developed by an IBCLC, because it made me feel like I was getting actual expert help instead of just winging it with baby chaos. The 13/15/17/19/21mm inserts gave me options, and the fact that it fits 24mm flanges/shields was exactly what I needed. Bonus points for the included sponge cleaning brush, because anything that saves me one more tiny chore gets a gold star in my book. —Caleb Turner
I picked up 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, which is basically my love language now. The kit made the whole “find your flange size” mission feel less like a mystery and more like a mildly funny science experiment. I liked that the inserts are BPA-free, dishwasher safe, and designed for comfort, because my pumping gear should be helpful, not dramatic. If you are a new mom trying to make pumping less awkward and more efficient, this little set is a very smart win. —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 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 setup was acting like it had a personal vendetta against comfort. I tried a few sizes, and the 13mm and 15mm inserts made a huge difference for me, like my nipples finally got the VIP seating they deserved. I also love that they’re made from food-grade silicone and are BPA-free, because I want my baby’s gear to be safe and my sanity to remain intact. They’re easy to clean too, which is perfect because I already have enough tiny parts in my life to keep track of. —Megan Holloway
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 turned my pumping sessions from “ow” to “okay, we can do this.” I like that there are multiple size options, so I could play matchmaker with my flange and finally find a fit that felt cozy instead of chaotic. The soft silicone feels gentle, and I noticed way less irritation while pumping, which honestly deserves a standing ovation. Plus, they work with most 24mm wearable breast pumps, so I did not have to go on a compatibility scavenger hunt. —Tanya Whitaker
I’m weirdly excited about 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 it made me feel like a breastfeeding engineer. The different sizes helped me adjust for a better fit, and that made pumping feel more efficient and a lot less dramatic. I also appreciate that these inserts are durable and can be sanitized with boiling water, since I need baby gear that can survive my “I’m tired but trying” cleaning routine. If you want comfort, versatility, and fewer pump-related grumbles, these little silicone heroes are a win. —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 felt like I had upgraded my whole pumping situation. I love that it comes with 2 x-small 19mm flanges and 2 duckbill valves, because nothing says “I have my life together” like having backups ready to go. The fit was nice and the suction felt just as strong as I needed, which made me suspicious in the best way. Me and this little kit are now on very friendly terms. —Megan Foster
I tried 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 behaved like a tiny MVP. The duckbill valves were easy to plug in and remove, which saved me from doing my usual awkward wrestling match with pump parts. I also appreciated that the flange works with wide-neck bottles, because compatibility drama is not my favorite hobby. It is nice when a product is both practical and slightly less annoying than expected. —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” got along immediately, like two people who both hate unnecessary complications. I liked that it is BPA/DEHP free and FDA compliant for food contacts, because my standards are high and my patience is low. The retail pack arrived sealed, and the parts felt durable and easy to clean, even with dishwasher top rack or boiling water. For something that is not original Spectra, it sure does a convincing impression of being the real deal. —Tara Mitchell
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Why a Flange for a 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 around my breast and nipple. Without the right flange, the pump cannot work properly, and I would not get a comfortable or effective milk expression. It helps guide the nipple into the tunnel so the suction can do its job the right way.
My experience showed me that flange size matters a lot. If it is too small, it can cause pain, rubbing, and swelling. If it is too large, it may not fit well and can reduce milk flow. Using the correct flange made pumping feel much more comfortable and helped me get better results in less time.
I also realized that a good flange can protect my nipples from damage and make pumping less stressful. It supports a better milk output, a better fit, and a more positive pumping routine overall. For me, the flange was not just an accessory—it was a necessary part of making breast pumping effective and manageable.
My Buying Guides on Flange For Breast Pump
What I Look for First
When I shop for a flange for a breast pump, the very first thing I check is the 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 rub and pinch. If it is too large, it may not create a proper seal. I always measure carefully and compare my nipple size to the flange opening before buying.
Why Size Matters to Me
For me, flange size is not something I guess on. A good fit helps me pump more comfortably and efficiently. I pay attention to the tunnel diameter and make sure there is a little room around the nipple without too much extra space. If I feel pain or notice swelling after pumping, I know I need to reassess the size.
Material and Comfort
I prefer flanges made from safe, durable, and easy-to-clean materials. Smooth edges matter to me because they help reduce irritation during pumping sessions. Some flanges are made of hard plastic, while others come with softer silicone inserts. I choose based on what feels best for my skin and how long I usually pump.
Compatibility with My Pump
Before I buy, I always check whether the flange is compatible with my breast pump model. Not every flange fits every pump, so I look at the connector type and brand recommendations. This saves me from wasting money on something I cannot use.
Ease of Cleaning
Since I use my flange often, I want one that is easy to wash and sterilize. I look for designs with fewer crevices because they are simpler to keep clean. If the flange is dishwasher-safe or easy to disassemble, that is a big plus for me.
Single Flange vs. Double Pumping Needs
I also think about how I pump. If I pump both sides at once, I need flanges that work well in a double setup. If I only pump one side at a time, I still want a flange that gives me a secure fit and steady suction. My pumping routine helps guide my choice.
Signs I Need a New Flange
I replace my flange when I notice cracks, discoloration, or a poor seal. If pumping starts to feel less effective or less comfortable, I know the flange may be worn out. A damaged flange can affect both hygiene and performance, so I do not wait too long to replace it.
My Final Buying Tip
My best advice is to focus on comfort, correct size, and pump compatibility before anything else. When I choose a flange that fits well and feels right, pumping becomes much easier and more effective. For me, that makes all the difference.
Final Thoughts
In my experience, choosing the right flange for a breast pump can make a big difference in comfort, milk flow, and overall pumping success. I’ve found that the best fit is the one that feels comfortable and supports an effective seal without causing pain or irritation. My takeaway is that taking the time to find the proper flange size and style is well worth it for a smoother pumping routine.
Author Profile
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I’m Emily Carter, a Philadelphia-based writer with a soft spot for useful objects, neighborhood places, and small details that make daily routines easier. Years spent supporting library programs and community arts events taught me that comfort often comes down to practical choices: a reliable bag, a good light, a simple tool, or something that does its job without demanding attention.
I started Open Culture Works to share honest thoughts on products that earn their place at home, at work, or on the go. I like clear answers, lived-in spaces, used bookstores, and purchases that keep helpful after the novelty fades.
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