will this work with bellababy?

no. for bellabay, please buy from the following https://www.amazon.com/Maymom-Compatible-Bellababy-Double-Electric/dp/B09W2KRSC5/ref=sr_1_2?crid=23GCK9QCNBTGZ&keywords=maymom%2Bbellababy&qid=1676120494&sprefix=maymom%2Bbella%2Caps%2C298&sr=8-2&th=1

Did anyone have trouble and feel like these ran big?

Yes I definitely felt these ran big as compared to standard spectra. It doesn’t make sense but 19mm was too big when it was the right size in spectra

I used mine before realizing it’s the wrong flange size, should I still return them?

I did the same thing. I just brought flange inserts that were my nipple size and just pushed it in for the correct sizing. But you can if you want.

Does this flange work with the Kiinde system?

Yes if you have the Kiinde adapters

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21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve

Product ID: 193836008

Details

Brand
Maymom
Color
White Valve
Included Components
Breast Flange
Material
Plastic
Special Feature
Closed System

📏21mm precision flange size

🔄Compatible & interchangeable with Spectra S1, S2, S1Plus

🧴BPA/DEHP free, FDA compliant

€ 46.13

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🍼 Upgrade your pump game with Maymom’s precision parts—because your comfort deserves the best!

SAFE CERTIFIED - BPA and DEHP free materials, independently lab-tested and FDA compliant for peace of mind during every pumping session.
PERFECT FIT EVERY PUMP - 21mm flange engineered for seamless compatibility with Spectra S1, S2, and S1Plus models, ensuring optimal suction and comfort.
HYGIENIC EASY TO CLEAN - Manufacturer-sealed retail packaging with resistance to boiling, steam cleaning, and microwave sterilization for effortless maintenance.
DURABILITY MEETS CONVENIENCE - Duckbill valves designed for easy plug-in and removal, crafted from premium silicone for long-lasting performance.
VERSATILE BOTTLE COMPATIBILITY - Works flawlessly with Spectra wide-neck, Avant, and Maymom wide-mouth bottles—flexibility that fits your lifestyle.

Maymom’s 21mm flange and duckbill valve set offers a high-quality, BPA-free replacement compatible with Spectra S1, S2, and S1Plus breast pumps. Engineered for durability and ease of use, these parts deliver OEM-level suction performance and fit a variety of wide-neck bottles. Independently lab-tested and FDA compliant, they provide a safe, hygienic, and versatile pumping experience trusted by thousands of parents.

Specifications

ASIN	B0863NBHRX
ASIN	B0863NBHRX
Additional Features	Closed System
Best Sellers Rank	#240 in Baby ( See Top 100 in Baby ) #15 in Breastfeeding Supplies
Brand Name	Maymom
Color	White Valve
Customer Reviews	4.7 4.7 out of 5 stars (6,024)
Date First Available	March 19, 2020
Included Components	Breast Flange, Valve
Is the item dishwasher safe?	No
Item Weight	0.08 Kilograms
Item model number	S012W-FxxDx2
Manufacturer	Maymom
Manufacturer	Maymom
Manufacturer Part Number	ca_S012W-FxxDx2
Manufacturer recommended age	0 - 3 years
Material Type	Plastic, Silicone
Model Number	S012W-FxxDx2
Product Dimensions	5.51 x 2.36 x 6.69 inches; 2.82 ounces
Product Style	Flange 21mm + Valves
Size	21 mm Flanges
Unit Count	1.0 Count

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How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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The product exactly matches the description. Very satisfied with my purchase.

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€ 46.13

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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