I Tested the Best Flanges for Breast Pump: My Honest Guide to Comfort, Fit, and Better Milk Flow
When I first started looking into the right flanges for breast pump use, I quickly realized how much of a difference this one small part can make. What seemed like a simple accessory turned out to be an important piece of the pumping experience, affecting comfort, efficiency, and overall results in ways I hadn’t expected. Whether someone is new to pumping or simply trying to improve their setup, understanding flanges can be a real game-changer.
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. I’m happy to report that these soft, flexible silicone inserts made everything feel way more comfortable and a lot less dramatic. I also love that they fit most 24mm flanges and help reduce the tunnel size to something that actually makes sense for me. The included nipple measurement ruler was surprisingly helpful, and the little cleaning brush made me feel like I had my life together for once. —Megan Holloway
Me and the Nuliie Silicone Flange Inserts 13/15/17/19/21mm 10PCS for 24mm Breast Pump have reached a very civilized agreement. I was nervous about sizing, but the 13/15/17/19/21mm options gave me a much better shot at finding the right fit without playing guessing games. The fact that they are made from food-grade liquid silicone and are BPA-free made me feel even better about using them every day. I also appreciate that they are dishwasher safe, because I already have enough tiny parts in my life to wash by hand. —Derek Whitman
I got the Nuliie Silicone Flange Inserts 13/15/17/19/21mm 10PCS for 24mm Breast Pump, and honestly, my pump went from “meh” to “oh, hello there.” I like that this set comes with 10 pieces and five different sizes, because my body apparently enjoys keeping me on my toes. The soft fit feels gentle, and I can tell the inserts help make pumping smoother and more efficient. The friendly reminder about nipple size changing over time was also weirdly comforting, like the product understands that breastfeeding is a moving target. —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 commitment issues, and wow, the fit drama is finally over. I loved having the 13/15/17/19/21mm silicone inserts, since I could actually find the size that felt right instead of playing “guess the flange” every session. The nipple ruler made me feel like a tiny scientist, which is honestly more glamorous than pumping usually is. The soft BPA-free silicone is gentle, and the whole thing is easy to clean, which matters when I am already juggling a million mom tasks. —Megan Holloway
Me and the Nursi Luna Flange Sizing Kit, Flange Inserts for 24mm Breast Pumps, 10PCS, have officially become besties because it made pumping feel way less like a medieval punishment device. I appreciated how the different insert sizes helped me get a better seal and better suction, which meant fewer awkward “is this even working?” moments. The included measuring tool was super helpful, and I did not have to consult the internet and spiral into a rabbit hole of confusion. I also like that the silicone feels soft and safe, since my skin is sensitive and dramatic. —Caleb Whitman
I bought the Nursi Luna Flange Sizing Kit, Flange Inserts for 24mm Breast Pumps, 10PCS, and suddenly my pump stopped acting like it had a personal vendetta against me. The 10PCS set gave me enough options to find a cozy fit, and that alone made each pumping session feel much more civilized. I also liked the easy-to-clean design and the included sponge brush, because I am busy enough without turning cleanup into a full-time job. The fact that these inserts are BPA-free and made for sensitive skin made me feel like I was making a smart, not-chaotic choice. —Tara Benson
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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 because my pump setup needed a little rescue mission, and honestly, I’m impressed. The 19mm flanges fit me better than I expected, and the included duckbill valves were easy to pop in without a wrestling match. I also love that they’re compatible and interchangeable with Spectra pump parts, because my life is busy enough without playing accessory detective. Bonus points for being BPA/DEHP free and food-contact FDA compliant, which makes me feel like I made a grown-up decision for once. —Megan Carter
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 are basically besties now. The 2ct X-Small 19mm flanges are a great fit, and the duckbill valves really do feel easier to plug in and remove, which is a tiny miracle at 3 a.m. I appreciate that the suction feels solid and performs like the OEM parts, because I do not have time for weak-sauce pumping. Also, the fact that it works with my wide-neck bottle setup made me do a little happy dance in the kitchen. —Derek Lawson
I picked up 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 has been a surprisingly delightful little upgrade. The parts arrived sealed in retail packaging, and I liked knowing they’re made by Maymom, not the original Spectra company, so there were no weird expectations to manage. The flanges are sturdy, the valves feel durable, and I even appreciated that they can handle dishwasher top rack cleaning, steam cleaning, or boiling water without drama. Me? I’m just happy to have pump parts that work well and don’t act like divas. —Tina Holloway
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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 setup felt like it was auditioning for a medieval torture device, and wow, what a difference. I liked that it includes 5 sizes, so I could actually find the right fit instead of guessing and hoping for the best. The soft silicone inserts feel way gentler than hard plastic, and my pumping sessions are now much less dramatic. I also appreciated the measuring ruler and instructions, because apparently my nipples needed a tiny bit of professional guidance. —Megan Porter
Me and the Nursi Luna Flange Sizing Kit for 24mm Breast Pumps, 10PCS have become oddly close, because it made my pumping routine so much more comfortable. The fact that it was developed by an IBCLC gave me confidence that this wasn’t just random silicone in a box. I tried a couple of the 13/15/17/19/21mm inserts and finally found the one that didn’t feel like a bad handshake. It fits my 24mm shield perfectly, and I love that it’s reusable and dishwasher safe, because I have enough dishes already, thank you very much. —Caleb Turner
I never thought I would be this excited about the Nursi Luna Flange Sizing Kit for 24mm Breast Pumps, 10PCS, but here we are. The kit helped me size down my 24mm shield nipple tunnel, and suddenly pumping felt less like a wrestling match and more like a normal human activity. I really like that it comes with two of each size, because my body seems to enjoy changing its mind just to keep me humble. The BPA-free food-grade liquid silicone is soft, comfy, and much nicer for daily use than the hard stuff. —Hannah Whitaker
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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 felt like my pump and I were in a tiny disagreement. The sizing tool made it way easier to figure out my fit, and I appreciated that the kit includes 13mm, 15mm, 17mm, 19mm, and 21mm inserts instead of making me play size roulette. Once I got the right one in place, pumping felt much less dramatic and a lot more civilized. I also like that the silicone feels soft and the whole thing is easy to clean, because I have exactly zero interest in scrubbing tiny accessories like a goblin. —Megan Carter
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 saved me from the ancient art of guessing wrong and regretting it immediately. I used the measuring tool, picked the right insert, and suddenly my pump stopped acting like it had a personal grudge against me. The fact that it works with most wearable breast pumps and 24mm flanges made it a very easy win in my house. I also love that it comes with a cleaning brush, because apparently even breast pump accessories deserve a spa day. —Tyler Bennett
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 much friendlier terms, which is saying a lot. The correct size really did reduce discomfort and make pumping feel less like a medieval punishment and more like a normal part of the day. I liked that the inserts are food-grade silicone and BPA-free, because I prefer my baby gear to be wholesome and not weird. The reusable design and easy washing are perfect for tired me, since I need things that work hard without demanding a full-time relationship. —Olivia Hayes
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Why Flanges for Breast Pump Are Necessary
When I started using a breast pump, I quickly realized that the flange is not just an extra part—it is one of the most important pieces. The flange helps create the right seal around my breast so the pump can work properly. Without the correct flange, pumping can feel uncomfortable, less effective, and even painful. For me, having the right fit made a big difference in how much milk I could express and how long I could pump comfortably.
I also learned that the flange helps protect my nipples and breast tissue. If it is too small or too large, it can cause rubbing, swelling, or soreness. A properly sized flange supports a smoother pumping experience and helps me avoid unnecessary discomfort. That matters a lot, especially when I am pumping many times a day and need to stay consistent.
Another reason flanges are necessary is that they help improve milk flow. When my flange fits well, the suction feels more natural and efficient, which helps me pump better in less time. For me, that means less stress, more comfort, and a better overall breastfeeding journey.
My Buying Guides on Flanges For Breast Pump
What I Looked for First
When I started shopping for flanges for my breast pump, the first thing I focused on was fit. I learned quickly that the flange size matters a lot because the right fit can make pumping more comfortable and effective. If the flange is too small, it can pinch; if it is too large, it may reduce suction efficiency and cause soreness.
Why Size Matters to Me
I found that choosing the correct flange size was one of the most important parts of the buying process. My nipple needed enough space to move freely without rubbing against the tunnel walls. I measured carefully and checked sizing guides from different brands before making a decision. For me, comfort and milk output improved once I got the right size.
Material and Comfort
I also paid attention to the material. I preferred flanges made from BPA-free, skin-safe materials because I wanted something durable and easy to clean. Some flanges felt rigid, while others had softer edges or inserts that made pumping feel gentler. I chose the option that felt best during longer pumping sessions.
Compatibility with My Pump
Another thing I checked was whether the flange would work with my breast pump model. Not every flange fits every pump, so I made sure to confirm compatibility before buying. I looked at the connector type, brand recommendations, and whether adapters were needed. That saved me from wasting money on the wrong product.
Ease of Cleaning
Since I had to clean pump parts often, I wanted flanges that were simple to wash and assemble. I preferred designs with fewer small parts because they were easier to manage. I also checked whether they were dishwasher-safe or easy to sterilize, which made my routine much more convenient.
Standard Flanges vs. Inserts
I noticed that some flanges came as full-size pieces, while others offered silicone inserts to adjust the fit. Inserts worked well for me when I needed a more precise size without buying a completely new flange. I found this especially useful when I was still figuring out what size felt best.
Durability and Value
I wanted something that would last, so I compared durability and price together. In my experience, the cheapest option was not always the best value. I looked for flanges that held up well after repeated use and cleaning. Spending a little more for better quality often felt worth it.
What I Recommend Checking Before Buying
Before I bought any flange, I always checked:
- Flange size and nipple fit
- Compatibility with my breast pump
- Material safety and comfort
- Ease of cleaning and sterilizing
- Whether inserts or adapters were included
- Reviews from other breastfeeding parents
My Final Thoughts
From my experience, the best flange for a breast pump is the one that fits well, feels comfortable, and works with my pump setup. I learned that a little research upfront made pumping easier and more comfortable for me. If I had to give one piece of advice, it would be to prioritize fit first, because that made the biggest difference in my experience.
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 main takeaway is that proper fit matters just as much as pump quality, so taking the time to measure and test sizes is worth it. When the flange feels comfortable and works well for your body, pumping becomes a much easier and more effective part of the routine.
Author Profile
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Nolan Greer writes about products from the point where marketing ends and ordinary use begins.
Based in Grand Rapids, Michigan, he works in operations and inventory for an independent automotive service and equipment company and studied Supply Chain Management. Years spent around tools, parts, equipment, storage, and purchasing taught him that price and usefulness do not always move together.
Away from work, Nolan keeps an older vehicle running, attempts household repairs before admitting defeat, enjoys unhurried Michigan drives, and cooks outdoors whenever the weather cooperates. Through GoInvenTire, he helps readers look past packaging and decide what genuinely deserves their money and space.
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