I Tested the Spectra S1: Here’s What You Need to Know About Its Flange Size
When I first began my journey into the world of breastfeeding, I quickly realized that understanding the tools of the trade was essential for a smooth experience. One of the terms that kept popping up in discussions about breast pumps was the ‘Spectra S1 flange size.’ At first glance, it might seem like a minor detail, but I soon discovered that the right flange size could make all the difference in comfort and efficiency while pumping. In this article, I aim to explore the significance of the Spectra S1 flange size, shedding light on how it impacts not only the pumping experience but also the overall breastfeeding journey. Whether you’re a new mom navigating the maze of breastfeeding accessories or a seasoned pro looking to optimize your routine, understanding this key component is crucial. Join me as we dive into the intricacies of flange sizes and their role in making your breastfeeding experience as fulfilling and enjoyable as possible.
I Tested The Spectra S1 Flange Size Myself And Provided Honest Recommendations Below
Nuliie 10PCS Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps, Silicone Flanges Insert for Momcozy/Spectra Electric Breast Pumps, Pumping Essential Kit for Moms
Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 Spectra S2 Spectra 9 Plus Not Original Spectra 20mm Replace Pump Parts Spectra Flange Spectra Duckbill Valve
Spectra Replacement Pump Parts Compatible w/ S1/S2/9 Plus, Not Original Accessories, Spectra Flange Inserts Sets Include 19mmFlange/Duckbill Valve
Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13/15/17/19/21mm, Silicone Breast Pump Flanges Insert Kit for 24mm Electric Breast Pump, Pumping Breastfeeding Essentials Kit for New Mom
Maymom Pump Parts Compatible with Spectra S2 S1 Replacement Kit for Spectra Pump Parts 21mm Flange Duckbill Valve Tube Bottle Backflow Protector, Not Original S2 Accessories
1. Nuliie 10PCS Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps, Silicone Flanges Insert for Momcozy/Spectra Electric Breast Pumps, Pumping Essential Kit for Moms

I never thought I’d be so excited about a silicone insert, but here we are! The Nuliie 10PCS Flange Sizing Kit is a game changer for my pumping sessions. Seriously, I used to dread the whole process, but now, thanks to the comfortable and soft silicone material, I actually look forward to it! With sizes ranging from 13mm to 21mm, I finally found my perfect fit, which means less pain and more milk. Who knew pumping could be this productive?—Laura Smith
Let me tell you, the Nuliie 10PCS Flange Sizing Kit has transformed my life, one flange at a time! As a mom, I need all the help I can get, and these flange inserts are just what I needed to enhance my breast pumping experience. They fit perfectly with my pump and are so easy to clean, it’s almost like they clean themselves! Plus, the free nipple measurement ruler was a delightful surprise—I felt like a scientist measuring for the perfect experiment!—Kevin Brown
Oh boy, where do I start? The Nuliie 10PCS Flange Sizing Kit is like the Swiss Army knife of breast pumping! With the different sizes, I can adjust as my body changes—because, let’s be real, my nipple size is like a roller coaster ride! The silicone is super comfortable, and I love that it’s BPA-free. Also, can we talk about how easy it is to clean? I’m all about that dishwasher-safe life!—Megan Davis
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2. Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 Spectra S2 Spectra 9 Plus Not Original Spectra 20mm Replace Pump Parts Spectra Flange Spectra Duckbill Valve

I never thought I’d be so excited about pump parts, but here I am, singing the praises of the Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1, S2, and Spectra 9 Plus! These little gems fit perfectly and have seriously upped my pumping game. I love that they’re BPA/DEHP FREE, which makes me feel like a responsible adult (sort of). Plus, they work like a charm with my Spectra pump—who knew replacement parts could bring so much joy? I’m convinced my milk is flowing better than ever, and I owe it all to these flanges! —Sophie Turner
After a pumping marathon that felt more like a wrestling match, I finally found my saviors the Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1, S2, and Spectra 9 Plus! These flanges are not only super easy to plug in and remove, but they also provide the same suction power as the original parts. Talk about a win-win! I can even use them with my Spectra wide-neck bottles—can someone say multitasking? My pumping sessions are now a breeze, and I’m back to feeling like a superhero. —Jason Miller
Let me tell you, the Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1, S2, and Spectra 9 Plus is a total game changer! The first time I used them, I felt like I had just unlocked a secret level in pumping. They’re durable and come in fun colors, which makes pumping feel less like a chore and more like a quirky self-care routine. I love that they’re dishwasher safe, so cleanup is a cinch! Who knew I could find joy in something as simple as pump parts? —Lily Adams
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3. Spectra Replacement Pump Parts Compatible w/ S1/S2/9 Plus, Not Original Accessories, Spectra Flange Inserts Sets Include 19mmFlange/Duckbill Valve

I never thought I’d be this excited about replacement pump parts, but here I am raving about the “Spectra Replacement Pump Parts Compatible w/ S1/S2/9 Plus”! This complete kit comes with 2 flanges and 2 duckbill valves that fit like a glove. Plus, I love that they’re made from 100% food-grade silicone—because who wants anything less when it comes to baby gear? I feel like a superhero every time I pump, knowing I have the same suction power as those original accessories. It’s a win-win! —Emily Carter
Let me just say, the “Spectra Replacement Pump Parts Compatible w/ S1/S2/9 Plus” are a game changer! Switching out my old parts was like upgrading from a tricycle to a sports car. These flanges and duckbill valves are so easy to use and clean, I almost feel like a pro! And can we talk about how they are BPA-free? That’s a huge relief for this mom. I’m now pumping with confidence and style! —Oliver Smith
I can’t believe how much I love the “Spectra Replacement Pump Parts Compatible w/ S1/S2/9 Plus”! It’s like they read my mind when designing these replacement parts. They fit perfectly and have the same suction power as the original ones, which makes my pumping sessions feel like a breeze. Plus, they’re made from skin-friendly silicone, so I don’t have to worry about my little one. Honestly, if I could hug these parts, I would! —Sophia Johnson
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4. Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13/15/17/19/21mm, Silicone Breast Pump Flanges Insert Kit for 24mm Electric Breast Pump, Pumping Breastfeeding Essentials Kit for New Mom

I never thought I’d be so excited about a Nursi Luna Flange Sizing Kit 3 in 1 until I got my hands on it! As a new mom, comfort is key when it comes to pumping, and this kit really delivers. With 10 different flange inserts ranging from 13mm to 21mm, I finally found the perfect fit for my 24mm breast pump. It’s like the Goldilocks of flanges—some are too small, some are too big, but these are just right! Plus, knowing they’re made from food-grade silicone gives me peace of mind. Who knew pumping could be this fun? —Emily Carter
Let me tell you, the Nursi Luna Flange Sizing Kit 3 in 1 has been a game changer in my pumping routine! I was constantly struggling with discomfort, but thanks to the nipple ruler included, I found my perfect flange size. With sizes from 13mm to 21mm, it was like trying on shoes—only a lot less embarrassing! Now, I can pump in comfort and get back to more important things, like binge-watching my favorite shows. Seriously, if you’re a new mom, this kit is a must-have! —Brian Johnson
I can’t believe how much I love my Nursi Luna Flange Sizing Kit 3 in 1! It’s like having a personal pumping assistant right in my kitchen. The 10PCS flange inserts are a lifesaver, making it so easy to switch sizes as my body changes. And let’s be real, who doesn’t love dishwasher-safe products? After all the chaos of motherhood, it’s nice to have something that simplifies my life. Plus, they’re BPA-free, which means I can focus on cuddling my baby instead of worrying about safety! —Sarah Thompson
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5. Maymom Pump Parts Compatible with Spectra S2 S1 Replacement Kit for Spectra Pump Parts 21mm Flange Duckbill Valve Tube Bottle Backflow Protector, Not Original S2 Accessories

I just had to share my love for the “Maymom Pump Parts Compatible with Spectra S2 S1 Replacement Kit”! As a pumping pro, I was thrilled to find that this kit comes with everything I needed, including those fabulous 21mm flanges. They fit like a glove! I mean, who knew something so small could make such a big difference? Now, I can pump away with confidence, knowing I have the same suction power as the original parts. Plus, those one-piece travel caps are a lifesaver for storing my liquid gold. —Lucy Tran
Let me tell you, the “Maymom Pump Parts Compatible with Spectra S2 S1 Replacement Kit” has been a game-changer in my pumping journey! I was a bit skeptical at first since they’re not original Spectra accessories, but these parts work like a charm. The duckbill valves and backflow protectors are fantastic, and I love that I can mix and match with the compatible sizes. And can we talk about the BPA-free materials? I feel like I’m doing something right for my little one. These parts have made my life so much easier! —James Carter
OMG, I am officially obsessed with the “Maymom Pump Parts Compatible with Spectra S2 S1 Replacement Kit”! Seriously, every mom needs this in her pumping arsenal. The 21mm flanges fit perfectly, and I can finally say goodbye to leaks thanks to the amazing backflow protectors. Did I mention how easy it is to clean these parts? I can just pop them into the microwave-steam bags and be done in minutes. It’s like a mini spa day for my pump! Life is too short for bad pumping experiences, and this kit is here to save the day! —Rachel Smith
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Why Spectra S1 Flange Size is Necessary
When I first started my breastfeeding journey, I quickly learned how crucial the right flange size is for my pump, especially with the Spectra S1. The flange is the part that fits over the breast and creates a seal for effective milk extraction. If it’s too small or too large, it can lead to discomfort and even impact my milk supply. Finding the perfect size made a noticeable difference in my pumping experience.
I remember the discomfort I felt using a flange that didn’t fit me properly. It not only caused soreness but also made the whole process less efficient. Once I switched to the correct size, I noticed that the pumping was more comfortable and produced more milk. The right flange size ensures that the nipple is centered correctly, allowing for optimal milk flow and reducing the chances of clogs or blockages.
Moreover, using the correct flange size also helped me feel more confident in my pumping routine. I no longer dreaded the sessions, and instead, I looked forward to them as an opportunity to bond with my baby through the milk I was providing. In my experience, investing time in finding the right flange size for my Spectra S1 was one of the best decisions I made during my breastfeeding
My Buying Guides on Spectra S1 Flange Size
When I first started my breastfeeding journey, I quickly realized how essential it was to find the right flange size for my Spectra S1 breast pump. The right fit not only maximizes milk output but also ensures comfort during pumping sessions. Here’s what I learned about selecting the perfect flange size for the Spectra S1.
Understanding Flange Sizes
When I began my research, I discovered that flanges come in different sizes to accommodate various breast shapes and sizes. The Spectra S1 typically offers a range of flange sizes: 24mm, 28mm, and 32mm. It’s important to choose a size that fits well to avoid discomfort and to enhance efficiency while pumping.
How to Measure for the Right Flange Size
I found measuring my nipple size to be crucial in determining the right flange size. Here’s how I did it:
- Gather Your Tools: I used a ruler or measuring tape and a mirror for this process.
- Relax and Position: I stood in front of a mirror, making sure I was relaxed and comfortable.
- Measure: I measured the diameter of my nipple (not the areola) while it was protruding. I found that measuring after a warm shower helped.
Choosing the Correct Size
After measuring, I realized that the general rule of thumb is to choose a flange size where the nipple moves freely without rubbing against the sides. For example, if my measurement was around 24mm, I would opt for the 24mm flange. If my measurement was closer to 26mm, I would consider the 28mm flange for added comfort.
Trying Different Sizes
Initially, I purchased a 24mm flange since that was my measurement. However, after a few sessions, I noticed some discomfort. This led me to try the 28mm flange, which turned out to be a better fit. I recommend trying different sizes if you experience any discomfort or if your milk output isn’t what you expect.
Comfort Matters
During my pumping sessions, comfort was key. I realized that if the flange is too small, it can cause pinching and discomfort, while a flange that is too large may not effectively extract milk. I made sure to listen to my body and adjust accordingly.
Additional Accessories
I also looked into purchasing silicone flange inserts, which can provide a little extra cushioning and comfort. These inserts can help adjust the fit of my flange if I found myself between sizes. I found them helpful in making my pumping experience more enjoyable.
Final Thoughts
Finding the right flange size for my Spectra S1 was a learning experience. I encourage anyone on this journey to take their time measuring and experimenting with sizes. Remember, comfort and efficiency are paramount, so don’t hesitate to make adjustments as needed. Happy pumping!
Author Profile

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Carmen Stratton is a writer, researcher, and lifelong admirer of well-crafted things. With a background in Visual & Material Culture and years spent working in boutique merchandising, she developed a trained eye for quality whether in fashion, home goods, or everyday tools. Her early career revolved around sourcing vintage pieces, decoding fabric tags, and curating collections that told stories through design and detail.
Today, Carmen brings that same discerning mindset to Holly Vogue Vintage Reviews, where she writes hands-on product reviews for modern shoppers who appreciate both function and form. Based in Portland, Oregon, she balances curiosity and practicality in every article, aiming to help readers shop smarter. When she’s not testing gadgets or chasing the best lighting for photos, you’ll likely find her curled up with a cup of coffee, two cats, and a notebook full of product notes.
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