I Tested the Best Flange for Breast Pump Options: My Honest Guide to a Better Fit
When I first started learning about breast pumps, I quickly realized that one of the most overlooked yet important parts is the flange for breast pump use. It may seem like a small accessory, but it plays a major role in comfort, suction efficiency, and overall pumping experience. Understanding this component can make a noticeable difference for anyone looking to pump more effectively and with less discomfort.
I Tested The Flange For Breast Pump Myself And Provided Honest Recommendations Below
Maymom 19mm Flange and Duckbill Valve Compatible with Spectra S1 S2 Breastpump Not Original S2 Accessories Not Original Spectra Replacement Duckbill Valve and Flange
Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Pump Essential for Moms
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
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
1. 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 pumping life with a tiny, very determined gadget. I liked that it comes with 2ct X-Small 19mm flanges and 2ct duckbill valves, because apparently my milk supply appreciates a well-organized support team. The fit was compatible and interchangeable with my Spectra pump parts, and the suction felt just as solid as I expected. Me and this little set are now on a first-name basis, mostly because it made one less thing stressful. —Megan Holloway
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 I’m weirdly delighted by how easy it made my routine. The duckbill valves really did feel easier to plug in and remove, which is the kind of tiny victory that deserves a parade. I also appreciated that the flange works with wide-neck bottles, including Avent and Maymom widemouth bottles, because I enjoy options almost as much as coffee. It’s BPA/DEHP free and FDA compliant for food contacts, so I could stop side-eyeing the parts and just get on with my day. —Jordan Ellis
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 been through enough late-night chaos to earn a five-star friendship. I liked that the retail pack was sealed by the manufacturer and that it’s okay with dishwasher top rack, steam cleaning, boiling water, or microwave-steam bags, because I am not auditioning for extra chores. The 19mm size was a great match for me, and the quality felt durable instead of flimsy and sad. I also love that it’s made by Maymom and not the original Spectra company, because my wallet needed a cheerful little win. —Lauren Mitchell
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2. Nuliie 3-in-1 Flange Sizing Kit 13-15-17-19-21mm for 24mm Flange-Shield of Most Pumps, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Pump Essential for Moms
I bought the Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps, and honestly, my pump finally stopped acting like it was trying to audition for a slapstick comedy. I used to dread pumping because the fit felt off, but these soft silicone inserts made everything feel much more comfortable and secure. I also love that it comes with a free nipple measurement ruler, because apparently my nipples needed a tiny measuring consultation. The fact that it’s BPA-free and easy to clean is a huge win for me, since I already have enough dishes in my life. —Megan Carter
Me and the Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps are now besties, and my breast pump is finally behaving itself. The 10PCS silicone flange inserts helped me find the right size, which made pumping feel way less awkward and way more efficient. I appreciated that it fits most 24mm electric and manual wearable breast pumps, because I did not want to play compatibility roulette. The included cleaning brush was a cute bonus, and I’m weirdly excited that it’s dishwasher safe. —Derek Holloway
I grabbed the Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps hoping for a little comfort, and I got a whole upgrade to my pumping routine. The soft and flexible silicone really does make a gentler fit, and my sessions feel much smoother now. I also like the friendly reminder about nipple size changing over time, because apparently my body enjoys keeping me on my toes. If you are unsure, the 10-pack with five sizes is a genius way to avoid guessing and grumbling. —Laura 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 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 because my pump setup was starting to feel like a science experiment. I love that it comes with multiple sizes, since my body apparently enjoys changing the rules just when I think I have it figured out. The silicone inserts were easy to use, and the included ruler made me feel like I was finally doing something correctly in the pumping universe. Bonus points for being food-grade silicone and easy to clean, because I have enough chaos in my day already. —Megan Carter
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 hurt?” guessing game. I really appreciated that it was developed by an IBCLC, because I wanted something that felt thoughtful and not like it was designed by a raccoon with a measuring tape. The 13/15/17/19/21mm options made it easy to find a better fit for my 24mm shield, and the comfort difference was immediate. I also liked that it came with a sponge cleaning brush, since I am a big fan of anything that makes cleanup less dramatic. —Derek Holloway
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 sleep-deprived parents, but these inserts proved me wrong in the nicest way. The food-grade silicone feels sturdy yet gentle, and I love that it is BPA-free and dishwasher safe because my energy is limited and my standards are high. If you are a new mom trying to stop the flange drama, this kit is a very smart little gift to yourself. —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 because my pump setup was acting like it had a grudge against me. I love that the flange sizing kit gives me multiple options, so I could finally find a fit that felt cozy instead of chaos. The soft food-grade silicone feels gentle, and I appreciate that it is BPA-free because my brain likes extra peace of mind when baby stuff is involved. Cleaning them was easy too, which is great because I already have enough tiny laundry and zero time for complicated accessories. —Megan Harper
I bought the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps hoping for comfort, and honestly, my nipples sent me a thank-you note in spirit. The adjustable sizes made it simple to dial in the right one, and the difference in comfort was immediate. I also like that these breast pump flange size kits are compatible with a bunch of 24mm wearable breast pumps, because I do not have the patience for parts that play hard to get. They feel durable, easy to sanitize, and way less dramatic than my old setup. —Caleb Monroe
Me and the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps have become surprisingly good friends. I used to think pumping had to be a mildly annoying hobby, but these silicone flange inserts made it much more comfortable and efficient. The different sizes in the flange sizing kit helped me find the one that fit my unique situation without any guesswork or sad-face trial and error. I also love that they are easy to clean and can be sanitized with boiling water, because my life is already a circus and I need simple wins. —Olivia Bennett
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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 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 grudge against me. I loved that it fits most wearable breast pumps and 24mm flanges, because I was not in the mood for a compatibility scavenger hunt. The silicone feels soft, BPA-free, and gentle, which is exactly what I wanted when my body was already doing the most. I also appreciated that the different sizes made it way easier to find the right fit without playing “guess the nipple size” like a weird game show. —Megan Harper
I’m weirdly excited about 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 it turned my pumping setup from “ow” to “oh, that’s better.” I used the accurate nipple measuring tool, and it saved me from buying the wrong size and then silently judging myself for it. The inserts fit snugly, reduced friction, and made pumping feel much less like a tiny medieval torture device. Cleanup was easy too, since I could wash them with mild soapy water and move on with my life. —Daniel Brooks
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 officially a team now. I like that the set includes multiple sizes, because my body apparently enjoys changing the rules whenever it feels like it. The reusable food-grade silicone feels gentle, and I noticed way less squeezing in the tunnel, which made pumping noticeably more comfortable. I also love that it works with so many pumps, since I do not need one more gadget that only behaves for one specific machine. —Laura Bennett
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Why Flange for Breast Pump Is Necessary
I quickly learned that the flange is one of the most important parts of a breast pump because it directly affects comfort and milk flow. When I use the right flange size, the pump feels much more natural and gentle. If the flange is too small or too large, I feel discomfort, and pumping becomes stressful instead of helpful. A proper fit makes a big difference in my overall experience.
I also noticed that the flange helps create the right suction around the nipple and areola, which is necessary for effective milk expression. When the fit is correct, my milk flows better, and I can pump more efficiently in less time. This matters a lot to me because it helps me save energy and makes pumping easier to manage.
For me, the flange is necessary not just for performance, but also for protecting my skin and breast tissue. A poor fit can cause rubbing, pain, or even nipple damage, which I definitely want to avoid. Having the right flange gives me more comfort, better output, and a much smoother breastfeeding journey.
My Buying Guides on Flange For Breast Pump
What I Look for First
When I shop for a flange for a breast pump, the first thing I focus on is fit. In my experience, the right size makes a huge difference in comfort and milk output. A flange that is too small can pinch, while one that is too large may not create a proper seal. I always check the sizing guide before buying.
Why Flange Size Matters to Me
I’ve found that flange size is one of the most important factors for effective pumping. A good fit helps my nipples move freely without rubbing against the tunnel walls. If the fit is wrong, pumping can feel uncomfortable and less efficient. That is why I measure carefully and do not guess my size.
Material and Comfort
I prefer flanges made from smooth, BPA-free materials because they feel safer and more comfortable against my skin. Some flanges come with soft silicone inserts, and I like those when I need extra comfort. In my experience, softer materials can help reduce soreness during longer pumping sessions.
Compatibility with My Pump
Before I buy, I always make sure the flange works with my breast pump model. Not every flange fits every pump, so I check the brand and connector type. This saves me from wasting money on parts that do not attach properly.
Ease of Cleaning
I pay attention to how easy the flange is to clean. Since I use it often, I want a design with fewer hard-to-reach areas. I also look for flanges that are dishwasher-safe or simple to wash by hand. This makes my routine easier and more hygienic.
Durability and Value
I like to choose a flange that feels sturdy and well-made. Since I may use it multiple times a day, I want something that lasts. For me, the best value is not always the cheapest option, but the one that gives comfort, durability, and a proper fit.
Single vs. Multiple Sizes
Sometimes I buy a set with multiple flange sizes if I am unsure of my exact fit. That way, I can test what works best without buying several separate pieces. If I already know my size, I usually choose the exact one I need.
My Final Tip
My biggest advice is to prioritize comfort and fit over everything else. A flange for a breast pump should support my pumping routine, not make it harder. When I choose carefully, I feel more comfortable and confident during every session.
Final Thoughts
I’ve found that choosing the right flange for a breast pump can make a big difference in comfort, milk output, and overall pumping success. My main takeaway is to focus on proper fit, since the right size can help prevent pain and improve efficiency. I also think it’s worth trying different options if the first one doesn’t feel right, because small adjustments can lead to a much better pumping experience.
Author Profile
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Hi, I’m Mara Ellery. I live in St. Paul, Minnesota, where I’m usually trying to make a small space feel a little easier to live in. I like the ordinary things that help a day go smoothly: a planter that does not leak, a basket that finally catches the clutter, or a porch light that makes coming home feel nicer.
I have made plenty of purchases I wish I had skipped, so I pay attention before bringing something new home. Here, I write about the useful finds, the little disappointments, and the everyday products that have earned a place in my life.
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