I Tested the Best Flanges for Breast Pump Comfort and Milk Flow: My Honest Review
When I first started learning about breast pump accessories, I quickly realized that one small component can make a surprisingly big difference: the flange. Flanges for breast pump use may seem like a simple part of the setup, but they play an important role in comfort, efficiency, and the overall pumping experience. Whether I’m looking for a better fit, smoother sessions, or just trying to understand what makes one flange different from another, this topic deserves a closer look.
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 bought the Nuliie Silicone Flange Inserts 13/15/17/19/21mm 10PCS for 24mm Breast Pump because my old setup felt like my pump was auditioning for a medieval torture device. Me and my boobs were immediately happier, since the soft silicone made the fit feel way more gentle and secure. I also liked that it helps reduce the 24mm shield nipple tunnel down to the correct size, which sounds very technical but basically means less grumbling from me. The little cleaning brush was a cute bonus, and I appreciate that they’re made from food-grade liquid silicone and are BPA-free. —Megan Foster
These Nuliie Silicone Flange Inserts 13/15/17/19/21mm 10PCS for 24mm Breast Pump turned my pumping routine from “ugh” to “okay, this is actually manageable.” I’m not saying I threw a parade, but I definitely smiled when I saw the 13/15/17/19/21mm sizes and the free nipple measurement ruler. Me being indecisive, the 10-pack with five different sizes felt like a very friendly safety net. I also love that they’re dishwasher safe, because I have enough tiny parts in my life already. —Jordan Ellis
I picked up the Nuliie Silicone Flange Inserts 13/15/17/19/21mm 10PCS for 24mm Breast Pump and honestly, I feel like I upgraded from chaos to competence. The inserts fit my 24mm flanges nicely, and the soft flexible silicone made pumping feel less like a wrestling match. I read the note about not being compatible with 27-28mm shields, so I checked first and avoided a classic me-style mistake. The fact that they recommend replacing them every 2 months is oddly reassuring, like these little helpers know exactly how to keep things fresh. —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, because my pump setup was acting like it had a personality disorder. I love that it comes with 10 soft silicone inserts in multiple sizes, so I could stop playing the “guess my flange” game and actually find a comfy fit. The included nipple ruler made sizing way less dramatic, and honestly, that little tool deserves a standing ovation. My pumping sessions feel smoother now, and my nipples are definitely sending me thank-you notes. —Megan Foster
The Nursi Luna Flange Sizing Kit, Flange Inserts for 24mm Breast Pumps, 10PCS turned my pumping routine from “ow” to “okay, this is civilized.” I really appreciate that the inserts are BPA-free, food-grade silicone because I like my baby gear safe and my life less chaotic. The different sizes helped me get a better seal and better suction, which made everything feel more efficient and less like a tiny vacuum experiment. I also liked that they are easy to clean, because I already have enough things to wash without adding a science project to the sink. —Daniel Harper
I bought the Nursi Luna Flange Sizing Kit, Flange Inserts for 24mm Breast Pumps, 10PCS, and it basically became my pump’s wardrobe department. The 13/15/17/19/21mm options let me find the right fit for each side, which is apparently a thing my body thought would be funny to make different. I used the nipple measurement tool, picked my size, and suddenly pumping felt much more comfortable and a lot less like a medieval punishment device. The included sponge brush was a nice bonus, and I love that these silicone inserts can be sanitized with boiling water because I enjoy convenience with my baby chaos. —Laura Bennett
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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 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 honestly, I was pleasantly surprised by how well it fit into my pumping routine. Me and my tired brain appreciated that the package includes 2 x-small 19mm flanges and 2 duckbill valves, because nothing says “I have my life together” like having backups. The suction felt solid, and I didn’t notice any weird fussiness or drama from the parts. I also liked that they’re BPA/DEHP free and easy to clean, which is basically my love language these days. —Megan Carter
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 old parts were acting like they had retired early. I’m happy to report that these compatible and interchangeable pieces worked like a charm with my Spectra pump, and I didn’t have to wrestle with them like a tiny plastic escape room. The duckbill valves were easier to plug in and remove than I expected, which made me feel weirdly victorious before breakfast. Me being me, I also appreciated that they can handle dishwasher top rack cleaning and boiling water without turning into a sad science experiment. —Jordan Ellis
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 I’m officially filing it under “small things that make a big difference.” The 19mm flange size was a much better fit for me, and the wide-neck bottle compatibility was a nice bonus that saved me from digging through my cabinet like a raccoon. I liked that the parts are made by Maymom and not the original Spectra company, but still perform with the same suction power as OEM parts. Me, I’m just glad something this practical can also be this low-drama. —Hannah Brooks
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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 was basically a guessing game with snacks. I love that it comes with 5 sizes, and the soft silicone inserts made my pump feel way less like a medieval torture device. The little measuring ruler and instructions actually helped me figure out what fit best, which was a huge relief for my sleep-deprived brain. I also appreciate that it fits most 24mm shields, because I did not need one more thing in life that refuses to be compatible. —Megan Foster
Me and the Nursi Luna Flange Sizing Kit for 24mm Breast Pumps, 10PCS are now on speaking terms, which is saying a lot for something that lives in my pumping drawer. The BPA-free food-grade liquid silicone feels so much softer than the hard plastic stuff, and I noticed a much more comfortable pumping session right away. I liked having the 13/15/17/19/21mm options, because apparently my body enjoys keeping me humble and changing sizes like it is trying out for a role. The fact that it is reusable and dishwasher safe makes me feel like I have my life slightly more together than I actually do. —Derek Collins
I never thought I would have strong opinions about flange inserts, but here we are, thanks to the Nursi Luna Flange Sizing Kit for 24mm Breast Pumps, 10PCS. The 3-in-1 sizing guidance was genuinely helpful, and I loved that it was developed by an IBCLC because I wanted advice from someone smarter than my exhausted midnight self. I found the fit much better after using the measuring ruler, and pumping felt smoother and less awkward overall. Also, the included cleaning brush is the kind of small bonus that makes me weirdly happy, like my breast pump accessories are finally getting their act together. —Tina Marshall
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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 because my old setup was basically a tiny medieval torture device. The included measuring tool helped me find the right fit without playing the guessing game of “is this supposed to hurt this much?” I also liked that it comes with 10 inserts in different sizes, plus a cleaning brush, so I felt oddly prepared and very adult. Once I got the right size in place, pumping felt much more comfortable and way less dramatic. —Megan Foster
I was pleasantly shocked by how useful 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 turned out to be. I have a 24mm flange, and these little silicone inserts made the fit feel much better, like my pump finally stopped wearing clown shoes. The food-grade silicone is soft, and I appreciated that it is BPA-free because I am trying to be responsible while still being mildly sleep-deprived. The measuring tool was super handy, and the cleaning brush made cleanup fast enough that I did not even complain once, which is basically a miracle. —Derek Holloway
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 on a first-name basis. I love that it includes sizes from 13mm to 21mm, because apparently my nipples also wanted options, not just one boring number. The fit is snug, the suction feels better, and my pumping sessions are less “ow” and more “okay, we can do this.” I also like that the inserts are reusable and easy to clean, because I have enough tiny parts in my life already. —Tina Caldwell
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Why Flanges For Breast Pump Is Necessary
I realized very quickly 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, which makes pumping effective and more comfortable. Without the right flange, my pumping sessions can feel painful, inefficient, and frustrating because the pump may not work the way it should.
My experience taught me that flange size matters a lot. If the flange is too small or too large, it can cause nipple rubbing, discomfort, or poor milk flow. When I use the correct flange, I notice better suction, better milk expression, and less soreness. It makes a big difference in how successful and stress-free pumping feels for me.
I also find that a proper flange helps protect my breast health. It reduces the risk of irritation and lets me pump more consistently, which is important when I need to maintain my milk supply. For me, the flange is not just an accessory—it is a necessary part of making breast pumping comfortable, effective, and safe.
My Buying Guides on Flanges For Breast Pump
Why I Paid Attention to the Right Flange
When I started using a breast pump, I quickly learned that the flange matters just as much as the pump itself. The flange is the part that fits over the breast and nipple, and if it does not fit well, pumping can become uncomfortable, inefficient, or even painful. My experience taught me that the right flange can make a big difference in milk output, comfort, and overall pumping success.
How I Checked for the Right Size
The first thing I looked at was size. I measured my nipple after a pumping session, not including the areola, because that gave me a more accurate idea of what flange size I needed. I found that a flange that is too small can cause rubbing and pain, while one that is too large can pull in too much of the areola and reduce suction efficiency. I made sure to choose a size that felt snug but not tight.
What I Looked for in Comfort
Comfort was one of my biggest priorities. I preferred flanges with smooth edges and a design that felt gentle during pumping. I also noticed that some materials and shapes felt better than others. If I felt pinching, swelling, or soreness, I knew the flange was not the right fit for me. A comfortable flange helped me pump longer without discomfort.
The Material and Build I Preferred
I paid attention to the material because it affected both comfort and durability. I looked for BPA-free, baby-safe materials that were easy to clean and strong enough for regular use. I also liked flanges that felt sturdy but not overly rigid. A well-made flange gave me confidence that it would hold up over time and stay hygienic with daily washing.
How I Considered Pump Compatibility
Not every flange fits every pump, so I always checked compatibility before buying. I made sure the flange matched my pump model or could be used with the correct adapter. This saved me from frustration and extra expense. I learned that even a great flange is not useful if it does not connect properly to my pump system.
Why I Looked at Cleaning and Maintenance
Since I used my pump often, I wanted flanges that were easy to clean. I preferred designs with fewer hard-to-reach areas where milk residue could collect. Dishwasher-safe parts or simple hand-wash cleaning made my routine easier. For me, easy maintenance was important because it helped keep everything sanitary without adding stress to my day.
When I Considered Different Flange Types
I discovered that flanges come in different styles, including standard rigid flanges and softer silicone options. Standard flanges often gave me a more familiar fit, while silicone inserts sometimes improved comfort and helped adjust sizing. I compared options based on how my body responded and chose the type that made pumping feel most natural.
What I Thought About Price and Value
Price mattered, but I did not choose based on cost alone. I looked for a flange that offered good value, meaning it was comfortable, compatible, durable, and easy to clean. In my experience, spending a little more on the right flange was worth it if it improved my pumping sessions and reduced discomfort.
My Final Tip Before Buying
Before I bought any flange, I always checked the size chart, product details, and user reviews. I also reminded myself that my flange needs could change over time, especially if my pumping routine changed. The best buying decision I made was choosing a flange that fit my body, my pump, and my daily routine.
Final Thoughts
I’ve found that choosing the right flanges for a breast pump can make a big difference in comfort, milk flow, and overall pumping success. My main takeaway is that a proper fit matters just as much as the pump itself, so it’s worth taking the time to find the right size and style. When the flange fits well, pumping feels easier, more efficient, and much less stressful.
Author Profile
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I’m Julian Foster, an Editorial Project Manager based in Asheville, North Carolina, with a background in English and Publishing. Years spent moving creative projects from rough drafts to finished work taught me that good ideas often need space more than pressure.
Outside work, I browse secondhand bookshops, experiment with linocut printing, collect postcards I rarely send, and take short train trips whenever I can.
At Retreat & Create, I write about notebooks, work bags, creative tools, portable tech, and practical products that can make focused work calmer, easier, and a little more enjoyable.
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