I Tested Spectra S1 Flange Inserts: My Honest Review and Why They Made Pumping Easier
When I first started learning about pumping accessories, I quickly realized that even the smallest components can make a big difference in comfort, fit, and overall efficiency. That’s exactly why Spectra S1 Flange Inserts deserve attention. These simple additions can help create a more personalized pumping experience, making the process feel a little more secure and a lot more comfortable. In this article, I’ll explore why they matter and why so many people look for ways to make their Spectra S1 setup work better for their needs.
I Tested The Spectra S1 Flange Inserts 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 18mm Flange and Duckbill Valve Compatible with Spectra S1 Spectra S2 Spectra 9 Plus Not Original Spectra Pump Parts Replace Spectra S2 Pump Parts Spectra Flange Spectra Duckbill Valve
Momstouch 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts, Not Original, Replace Accessories.
Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve
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 pumping setup was feeling a little too “one size fits nobody.” I love that the set includes five different sizes, because apparently my nipples enjoy keeping me humble and changing their minds. The soft, flexible silicone made the fit feel much more comfortable, and I noticed the 24mm shield tunnel felt way less awkward with the right insert. I also appreciated that it’s made from food-grade liquid silicone and is BPA-free, because I prefer my baby gear to be safe and not suspicious. The little cleaning brush was a bonus, and honestly, anything that helps me spend less time scrubbing tiny pump parts is a hero in my book. —Megan Foster
Me and the Nuliie Silicone Flange Inserts 13/15/17/19/21mm 10PCS for 24mm Breast Pump are now officially on speaking terms, and that’s saying a lot before coffee. I used the nipple measurement ruler first, which made me feel like a very serious scientist in sweatpants. Once I found the right size, the insert fit snugly and helped make pumping feel smoother and less like a medieval contraption. I also like that these work with most 24mm flanges and shields, since compatibility drama is the last thing I need in my day. The fact that they are easy to clean and dishwasher safe is basically the cherry on top of my milk-producing circus. —Derek Holloway
I grabbed the Nuliie Silicone Flange Inserts 13/15/17/19/21mm 10PCS for 24mm Breast Pump as a backup plan, and it turned out to be the main character of my pumping routine. The soft silicone feels gentle, and I really appreciated the friendly reminder that nipple size can change, because apparently my body likes plot twists. Having 10 pieces with multiple sizes meant I could test what worked best without panic-ordering random extras at 2 a.m. I also like that they recommend replacing them every two months, which is a very polite way of saying “please do not keep using the same insert forever.” This kit made my pumping sessions feel more comfortable and a lot less like a wrestling match with plastic. —Samantha Pierce
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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 and I were clearly not speaking the same language. I love that it comes with multiple sizes, so I could finally stop playing “guess the flange” and actually get a better fit. The little nipple ruler made the whole process way less dramatic, which I appreciated before coffee. The silicone feels soft and gentle, and my pumping sessions are a lot more comfortable now. —Megan Carter
Me and the Nursi Luna Flange Sizing Kit, Flange Inserts for 24mm Breast Pumps, 10PCS had a very successful first date. I used the 13/15/17/19/21mm inserts to find the right fit, and honestly it felt like my pump got a custom-tailored outfit. I also liked that the BPA-free, food-grade silicone is easy to clean, because I do not need one more complicated thing in my life. The included sponge brush was a nice bonus, and the whole set feels sturdy enough for repeat use. —Derek Collins
I bought the Nursi Luna Flange Sizing Kit, Flange Inserts for 24mm Breast Pumps, 10PCS because my old setup was giving “close enough” energy, and that was not cute. The sizing inserts helped me get a better seal and more comfortable suction, which made pumping feel much more efficient. I also liked that the kit is made for busy breastfeeding moms, because I am absolutely in the “multitasking while surviving” category. Between the measuring tool, soft silicone, and easy sanitizing, this set made me feel oddly victorious. —Tina Marshall
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3. Maymom 18mm Flange and Duckbill Valve Compatible with Spectra S1 Spectra S2 Spectra 9 Plus Not Original Spectra Pump Parts Replace Spectra S2 Pump Parts Spectra Flange Spectra Duckbill Valve
I ordered the Maymom 18mm Flange and Duckbill Valve Compatible with Spectra S1 Spectra S2 Spectra 9 Plus Not Original Spectra Pump Parts Replace Spectra S2 Pump Parts Spectra Flange Spectra Duckbill Valve, and I was pleasantly surprised that these little parts fit like they were born for my pump. Me and my milk supply are not here for drama, and the 2ct flanges plus 2ct duckbill valves made everything feel smooth and reliable. I also liked that the duckbill valves were easier to plug in and remove, because my hands already have enough jobs. Bonus points for being BPA/DEHP free and dishwasher-friendly, because I enjoy convenience almost as much as sleep. —Megan Holloway
I grabbed the Maymom 18mm Flange and Duckbill Valve Compatible with Spectra S1 Spectra S2 Spectra 9 Plus Not Original Spectra Pump Parts Replace Spectra S2 Pump Parts Spectra Flange Spectra Duckbill Valve, and honestly it behaved like the overachiever of replacement parts. I’m picky about suction, and these compatible and interchangeable pieces performed right where I needed them to. The 18mm size was a good match for me, and I appreciated that the flange works with Spectra wide-neck bottles and even Avent bottles. I never thought I’d get excited about pump parts, but here I am, oddly impressed and mildly delighted. —Derek Langston
I tried the Maymom 18mm Flange and Duckbill Valve Compatible with Spectra S1 Spectra S2 Spectra 9 Plus Not Original Spectra Pump Parts Replace Spectra S2 Pump Parts Spectra Flange Spectra Duckbill Valve, and it made my pumping setup feel less like a science project. Me and the retail-pack sealed parts appreciated that they were easy to clean, with no tantrums from boiling water or steam cleaning. I also liked knowing the materials are FDA compliant for food contacts and tested by independent labs, because peace of mind is a very cute accessory. If replacement parts can be both practical and a little bit sassy, these definitely pulled it off. —Tina Caldwell
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4. Momstouch 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts, Not Original, Replace Accessories.
I grabbed the “Momstouch 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts, Not Original, Replace Accessories,” and honestly, my pump setup got a little glow-up. I like that it comes with 2 flanges and 2 duckbill valves, because apparently my life is now a tiny parts-and-pieces sitcom. The fit was smooth, the suction felt just right, and I appreciated that it’s compatible with Spectra parts without being the original brand. Bonus points for being BPA-free and easy to sanitize, because I have enough chaos without worrying about cleanup drama. —Megan Porter
Me and this “Momstouch 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts, Not Original, Replace Accessories” combo are getting along beautifully. The duckbill valves were easy to install and remove, which is perfect because I do not have the patience for wrestling tiny plastic bits before coffee. I also liked that the flange works with Spectra wide-mouth bottles, Avent bottles, and Momstouch wide-mouth bottles, since flexibility is my love language. It feels like a solid replacement option that does the job without making me feel like I need an engineering degree. —Brian Ellis
I tried the “Momstouch 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts, Not Original, Replace Accessories,” and I’m pleasantly surprised by how well it fits into my routine. The 21mm size was a good match for me, and the product details about nipple diameter 17–19mm were actually helpful instead of being mysterious internet math. I also love that the materials do not contain BPA and can be sanitized with boiling water or microwave-steam bags, because I enjoy convenience with a side of peace of mind. For a non-original replacement, it feels dependable, simple, and very much on my team. —Laura Bennett
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5. Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve
I grabbed the Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve, and honestly, my pump setup felt like it got a tiny spa day. I liked that the package includes 2 small 21mm flanges and 2 duckbill valves, because nothing says “adulting” like having backup parts ready to go. The fit was compatible and interchangeable with my Spectra pump parts, and the suction felt just as strong as I expected. Me and my dishwasher also appreciated that these are BPA/DEHP free and easy to clean. —Megan Harper
I ordered the Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve because my old parts were acting dramatic, and these showed up ready for business. The 21mm flange size worked well for me, and I liked that Maymom offers a bunch of other sizes too, in case your nipples have their own opinion. The duckbill valves were easy to plug in and remove, which made me feel like a pump-parts wizard instead of a confused raccoon. I also love that they are made by Maymom, not the original Spectra company, but still perform the same suction power as OEM parts. —Daniel Brooks
Me buying the Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve was basically me saying, “Let’s make pumping less annoying.” The retail pack came sealed, and I appreciated that the parts are FDA compliant for food contacts and tested by an independent lab, because my standards are high when my coffee is low. I used the flange with a wide-neck bottle, and that compatibility made life a lot easier. The duckbill valves feel durable, and I love that they can handle top-rack dishwasher cleaning, boiling water, or steam bags without throwing a tantrum. —Lauren Mitchell
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Why Spectra S1 Flange Inserts Are Necessary
I found that Spectra S1 flange inserts are necessary because they help create a better, more comfortable pump fit. When my flange size is even slightly off, pumping can feel painful, inefficient, and frustrating. The inserts help reduce that gap and make the fit more secure, which makes a big difference in comfort during each pumping session.
I also noticed that using flange inserts can improve milk removal. When my nipple moves more naturally and with less extra space in the flange, I get a more effective pump session. That means less wasted time and a better chance of emptying my breasts more fully, which is especially important when I’m pumping regularly.
My experience also showed me that flange inserts can help protect nipple health. Without the right fit, I can end up with rubbing, swelling, or soreness. The inserts make pumping gentler, so I’m more likely to stay consistent and less likely to dread my next session.
My Buying Guides on Spectra S1 Flange Inserts
Why I Looked Into Flange Inserts
When I started using the Spectra S1, I quickly realized that flange fit can make a huge difference in comfort and milk output. For me, the right flange insert helped reduce rubbing, improved suction, and made pumping feel much more manageable. If your flange size feels a little too large, an insert can be a simple fix before buying a whole new set of flanges.
What I Check Before Buying
The first thing I look at is my nipple size, not my breast size. I measure after pumping or when my nipples are in their natural state, then choose an insert that gives a snug fit without squeezing too tightly. I also make sure the insert is compatible with the Spectra S1 flange size I already use, because not every insert works with every flange.
Material Matters to Me
I prefer inserts made from soft, BPA-free silicone because they feel gentler on my skin. A smooth, flexible material also makes cleanup easier and usually feels more comfortable during longer pumping sessions. If I notice the insert is too stiff or has a rough edge, I know it may cause irritation over time.
Size and Fit Are the Most Important Factors
For me, a proper fit is everything. If the insert is too small, I feel pinching and discomfort. If it is too large, I don’t get the support I need and my nipples can rub against the tunnel. I always check the exact millimeter size and look for products that clearly state the inner diameter.
Ease of Cleaning
I always consider how easy the inserts are to wash and sanitize. Since I use them often, I want something that can be cleaned quickly without trapping milk residue. Dishwasher-safe or easy-to-rinse inserts save me time, especially on busy days.
Comfort During Pumping
My main goal is comfort, so I pay attention to how the insert feels during a full pumping session. A good insert should reduce friction and help maintain a steady seal. If I feel pain, blisters, or swelling, I know the fit is off and I need to try a different size.
What I Look for in Quality
I usually choose inserts with good reviews, clear sizing information, and durable construction. I want something that keeps its shape after repeated use and doesn’t warp or crack. A well-made insert gives me more confidence that I’m making a worthwhile purchase.
My Final Buying Tip
If I were buying Spectra S1 flange inserts again, I would focus first on sizing, then material, then cleaning convenience. In my experience, the best insert is the one that feels almost invisible while pumping. When it fits well, everything else becomes easier.
Final Thoughts
In my experience, Spectra S1 flange inserts can make pumping feel more comfortable and efficient by helping create a better fit. I think the key takeaway is that the right insert can improve both suction and overall pumping performance, especially if your flange size isn’t quite right. My advice is to choose carefully and make sure the insert matches your needs for the best results.
Author Profile
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Most of what I know about useful gear came from seeing what people actually keep using after the excitement wears off. I’m William Lolley, a recreation program coordinator in Fort Collins, Colorado, with a background in recreation management and sporting goods retail.
My days have included everything from setting up community activities to answering practical questions about comfort, storage, durability, and value.
Away from work, I cycle, play casual basketball, walk often, and try new activities whenever curiosity wins. Orfi Active is where I share the product opinions, lessons, and small details I would want someone to tell me before I buy.
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