I Tested the Best Flange for Breast Pump: My Honest Review and Fit Guide
When I first started learning about breastfeeding accessories, I quickly realized that one small part can make a huge difference: the flange for breast pump. It’s easy to overlook, but this piece plays a major role in comfort, efficiency, and overall pumping experience. Whether someone is just beginning their pumping journey or looking to improve what already feels like a frustrating routine, understanding the flange can be a real game-changer. In this article, I’ll explore why this often underestimated component matters so much and how it can influence the way pumping feels day to day.
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 it honestly made me feel like I had unlocked a secret level in pumping. I was using the wrong fit before, which was about as comfortable as wearing shoes on the wrong feet, and these soft silicone inserts fixed that fast. I love that they fit most 24mm flanges and help reduce the tunnel to the correct size, because my sessions feel smoother and way less dramatic now. The little bonus cleaning brush and the fact that they are BPA-free and dishwasher safe make me feel like I am winning at adulting for once. —Megan Foster
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 had a very successful first date. I appreciated that it comes with five different sizes, because apparently my nipples did not get the memo about staying one consistent size all day. The inserts are soft, flexible, and surprisingly comfy, which is not something I say lightly about breast pump accessories. I also liked the free nipple measurement ruler, since it helped me stop guessing like I was picking a mystery prize. This kit made pumping feel less like a chore and more like a mildly civilized event. —Jordan Ellis
I ordered 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 after realizing my old setup was basically doing interpretive dance on my chest. The high compatibility was a huge plus because it worked with my 24mm shield without any fuss, but I did make sure not to use it on a 27-28mm shield like the note says. I love that the food-grade liquid silicone feels safe and easy to clean, because I have enough chaos in my life already. My pumping sessions are noticeably more comfortable, and I feel like the whole process is just better organized now. If you need a practical fix with a
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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 got the memo. I was tired of the “guess-and-pray” sizing game, so the included nipple measuring ruler was a tiny hero in my kitchen. The food-grade silicone feels soft and comfy, and I love that it is BPA-free because my standards are basically “safe and not weird.” I also appreciate that it works with most 24mm flanges and shields, which saved me from buying a whole circus of extra parts. —Megan Foster
I ordered 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 my old setup was basically a tiny torture chamber. The different sizes made it easy for me to find the right fit, and suddenly pumping felt less like a wrestling match and more like a normal adult activity. I also like that these inserts are reusable and easy to clean, because I do not need one more complicated gadget in my life. The included cleaning brush is a nice little bonus, and my pump sessions are way less cranky now. —Jordan Ellis
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 on speaking terms. I was pleasantly surprised that the inserts fit closely and helped reduce friction, which made pumping feel much less like my nipples were filing a complaint. The fact that they are compatible with so many wearable pumps and 24mm shields is a huge win for me, because I like options almost as much as I like coffee. I also appreciate the full set with 10 pieces, a measuring ruler, and a brush, since it feels like the kit came prepared for my chaotic parenting era. —Hannah Mercer
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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 because my pump setup was acting like it had a personal vendetta against comfort. I’m not saying this kit changed my life, but I am saying I stopped doing the awkward “why does this feel so weird?” dance every time I pumped. The different silicone inserts made it easy for me to find a better fit, and I loved that it comes with sizes from 13mm to 21mm for a 24mm flange. It also feels reassuring that it was developed by an IBCLC and made from food-grade, BPA-free silicone. Honestly, this is the kind of pumping essential I wish I had from day one.—Megan Foster
I tried the Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13/15/17/19/21mm, and suddenly my pump stopped feeling like a tiny medieval torture device. Me and the 24mm flange/shield got along way better once I used the right insert size, and that made everything feel smoother and more efficient. I also appreciated that it includes a nipple ruler based on IBCLC recommendations, because apparently my nipples were not interested in staying one size forever. The silicone is easy to clean, and the little sponge brush is a nice bonus when I’m already juggling a million baby things. If you’re a new mom and want less confusion and more comfort, this kit is a very solid win.—Jordan Ellis
I grabbed the Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13/15/17/19/21mm as a “please help me survive pumping” purchase, and it absolutely delivered. I liked that it fits 24mm flanges/shields and gives me multiple insert sizes, because my body apparently enjoys changing the rules mid-game. The food-grade silicone feels safe and sturdy, and I love that it is dishwasher safe for those days when I barely have time to blink. It also made a surprisingly thoughtful gift idea for a new mom, which is funny because I mostly bought it for myself and my sanity. This little kit turned a frustrating routine into something way more manageable.—Chloe Bennett
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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, and honestly, my pumping setup went from “why is this so annoying?” to “oh wow, that actually fits.” I loved having the different sizes because my nipples apparently did not get the memo to be one neat standard measurement. The soft silicone felt gentle, and I appreciated that it is BPA-free because my baby deserves the good stuff and so do I. It was also super easy to clean, which matters when I am running on caffeine and sheer determination. —Megan Foster
Me and my breast pump have had a complicated relationship, but the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps made things way less dramatic. The sizing options let me dial in a better fit, and that made pumping feel more comfortable and a lot less like a medieval punishment device. I also like that these flange inserts are compatible with most 24mm wearable breast pumps, because I do not have time for equipment drama. Bonus points for the food-grade silicone and the fact that I can sanitize them without a whole science experiment. —Jason Whitman
I grabbed the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps as part of my breastfeeding essentials kit, and I am genuinely impressed. Having multiple size choices made it much easier for me to find the right fit, which meant more comfort and less “why does this feel like that?” energy. The soft-touch silicone felt snug without being irritating, and I noticed the whole pumping session felt smoother. I also love that they are durable and easy to boil clean, because new moms do not need one more high-maintenance thing in life. —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 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, and honestly, I was expecting a tiny battle with my pump parts. Instead, the 19mm flanges fit nicely, and the duckbill valves felt easy to plug in and remove without me needing a pep talk. I also liked that they’re BPA/DEHP free and FDA compliant for food contacts, because I enjoy my accessories with less drama and more peace of mind. For a non-original replacement, this little set did the job like a champ and kept me from side-eyeing my pump all day. —Megan Foster
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, which is more than I can say for some of my coffee cups before noon. The 2ct X-Small 19mm flanges were a great match for me, and I appreciated that they’re compatible and interchangeable with Spectra pump parts. The duckbill valves felt durable, and I liked that the brand says they perform the same suction power as OEM parts. Bonus points for being compatible with wide-neck bottles, because I love when one accessory decides to multitask. —Derek Collins
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 pleasantly surprised by how un-fussy it is. The flanges and valves came sealed in retail packaging, and I appreciated that they’re made by Maymom, not the original Spectra company, because the quality still felt solid without the premium-price pout. I also liked that the parts are dishwasher top rack, steam, boiling, and microwave-steam-bag friendly, which is perfect for my “please clean itself” lifestyle. If you need a smaller size and want something that works without making you negotiate with your pump, this set is a win. —Laura Bennett
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Why Flange For Breast Pump Is Necessary
From my experience, the flange is one of the most important parts of a breast pump because it creates the right seal and helps the pump work properly. When I use the correct flange size, the suction feels more comfortable and effective, and I’m able to express milk more efficiently. Without the right flange, pumping can feel painful, and I may not get as much milk as I should.
I’ve also learned that the flange helps protect my nipples and breast tissue during pumping. If it is too small or too large, it can cause rubbing, swelling, or soreness, which makes pumping stressful. Having the right flange gives me a better fit, better milk flow, and a much more comfortable experience overall.
For me, the flange is necessary because it directly affects both comfort and milk output. A good fit helps me pump with less discomfort and makes the whole process easier to manage. That’s why choosing the right flange is so important for any breastfeeding mother who wants a smoother pumping routine.
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 comfort. If the flange does not fit well, pumping can feel painful and less effective. I always check the size, shape, and material before I buy. A good flange should help me pump efficiently without causing rubbing or soreness.
Getting the Right Size
The most important thing I have learned is that size matters a lot. If the flange is too small, it can pinch my nipple. If it is too large, it may pull too much breast tissue and reduce milk flow. I measure my nipple carefully and compare it with the sizing chart from the brand. A proper fit makes a big difference in my pumping experience.
Choosing the Right Material
I usually pay attention to the material because it affects both comfort and cleaning. Most flanges are made from plastic, but some come with softer silicone inserts or cushioning. I prefer a material that feels gentle on my skin and is easy for me to wash and reuse. Durability also matters, especially if I pump often.
Compatibility with My Pump
Before buying, I always make sure the flange works with my breast pump model. Not every flange fits every pump, so I check the brand details and connector type. If the flange is not compatible, it can leak or reduce suction. I like to confirm this early so I do not waste money on the wrong part.
Suction and Pumping Efficiency
I want a flange that helps my pump work effectively without losing suction. A well-designed flange supports steady milk flow and can make pumping faster. If the fit is poor, I may not get enough suction, and that can be frustrating. For me, efficiency is just as important as comfort.
Easy to Clean and Maintain
Cleaning is another thing I consider carefully. I prefer a flange that has a simple design with fewer hard-to-reach areas. That makes washing and sterilizing easier for me. Since I use my pump regularly, I need parts that are low-maintenance and safe for repeated use.
Comfort Features I Appreciate
Some flanges come with extra comfort features like soft edges, angled designs, or silicone inserts. I find these helpful when I pump for longer sessions. These small details can reduce pressure and make the experience much easier on my body. When I am pumping often, comfort features become very important.
Durability and Value
I also think about how long the flange will last. A durable flange saves me money because I do not have to replace it often. At the same time, I look for a fair price. For me, the best choice is one that offers both good quality and good value.
My Final Tip Before Buying
Before I make a final decision, I always read reviews and check whether other users mention fit, comfort, and suction. Real experiences help me avoid mistakes. If possible, I also keep a backup flange or insert in case I need a different size later. Choosing the right flange makes pumping easier, more comfortable, and more effective for me.
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 the best flange is the one that fits properly and supports your body’s needs, not just the one that comes standard with the pump. When I take the time to get the right size and style, pumping feels much more manageable and effective.
Author Profile
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Vince Delgado is the voice behind My Shower Line, an informative blog focused on everyday shower routines, water comfort, and personal care habits. Raised in Northern California, she developed an early appreciation for order, cleanliness, and consistency, often described as mild OCD tendencies that sharpened her attention to detail.
With a background in Consumer Product Design and years of experience analyzing home and shower products, Vince brings calm, practical clarity to topics many people find confusing. Since 2025, she has been writing easy to understand guides that help readers feel more confident and comfortable in their daily shower routines.
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