Best Selling Medela 21mm Flange: See Top Product Rankings by Sales Volume & Market Trends

July 2026
125 Products Tracked

Looking for the most popular medela 21mm flange products in the market? Our report leverages real Amazon monthly sales data to identify the best-performing products and the fastest-growing opportunities within the search results for the keyword "medela 21mm flange." Whether you're searching for winning products to launch or monitoring market trends and competitor performance, this report provides the insights you need.

Based on monthly sales analytics, our Shoppers' Top Picks highlights that ASIN B0CMPBBHMZ currently leads the medela 21mm flange market with 10K monthly sales, followed closely by B077962FZH with 8K monthly sales and B0CKZH37FX with 7K monthly sales. Meanwhile, ASIN B077962FZH stands out as the fastest-growing product, achieving an impressive 100.0% month-over-month sales growth. By tracking competitor sales performance and shifts in market demand, sellers can uncover emerging opportunities and make more informed product and marketing decisions.

🏆Shoppers' Top PicksAmazon
by monthly sales July 2026
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
1
B0CMPBBHMZ
$9.99·
4.6
Units/sold10K
Medela Contact Nipple Shields for Breastfeeding
2
B077962FZH
$8.48·
4.4
Units/sold8K
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
3
B0CKZH37FX
$9.99·
4.6
Units/sold7K
🚀Fastest Growing
by MoM sales growth
Medela Contact Nipple Shields for Breastfeeding
#1
B077962FZH
$8.48·
4.4
Medela Contact Nipple Shields for Breastfeeding
Units/sold
8K100.0%
Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve
#2
B0863NBHRX
$18.98·
4.7
Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve
Units/sold
2K100.0%

Top Selling Medela 21mm Flange

As of July 2026, we analyzed 125 tracked products in Amazon's "medela 21mm flange" search results and generated the following sales chart and product rankings based on monthly sales data. The ranking below highlights the Top 10 products by estimated monthly sales. According to the latest data, these products generated between 1,000 and 10,000 monthly sales. B0CMPBBHMZ leads the medela 21mm flange market with an estimated 10,000 monthly sales, up 11.1% from the previous month.

125Products Tracked
3,800Top 10 Avg. Sales
$14.24Top 10 Avg. Price
4.6Top 10 Avg. Rating
🏆
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
#1
B0CMPBBHMZ

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

10,000
▲ 11.1%
Units Sold/mo
$9.99
Price
4.6
Rating
4.2K
Reviews
2
Medela Contact Nipple Shields for Breastfeeding
B077962FZH
$8.48
4.4 (31.9K)
Medela Contact Nipple Shields for Breastfeeding
8,000 Units Sold/mo▲ 100.0%
3
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
B0CKZH37FX
$9.99
4.6 (2K)
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
7,000 Units Sold/mo▲ 1.7%
4
Nursi Luna Flange Sizing Kit 3-in-1 with 13/15/17/19/21mm for 24mm Electric Breast Pump Flanges/Shields, 10PCS Soft Silicone Flange Inserts for More Comfortable Pumping, BPA-Free, Essential for Moms
B0CY81WHD5
$9.99
4.6 (2.1K)
Nursi Luna Flange Sizing Kit 3-in-1 with 13/15/17/19/21mm for 24mm Electric Breast Pump Flanges/Shields, 10PCS Soft Silicone Flange Inserts for More Comfortable Pumping, BPA-Free, Essential for Moms
6,000 Units Sold/mo▲ 50.0%
5
Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve
B0863NBHRX
$18.98
4.7 (6K)
Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve
2,000 Units Sold/mo▲ 100.0%
10
Willow Breast Pump Sizing Kit - Flange Sizing Kit - Use w/Willow Go, Wave, or Most 24mm Flanges - Includes 13mm, 15mm, 17mm, 19mm, and 21mm Inserts- Breastfeeding Essentials for Postpartum
B0GR7S9P4L
$15.03
4.9 (37)
Willow Breast Pump Sizing Kit - Flange Sizing Kit - Use w/Willow Go, Wave, or Most 24mm Flanges - Includes 13mm, 15mm, 17mm, 19mm, and 21mm Inserts- Breastfeeding Essentials for Postpartum
1,000 Units Sold/mo▲ 4.0%
View All 125 Products & Deep InsightsGet full access to sales data, trends, and market analysis

For sellers and category managers benchmarking the medela 21mm flange price landscape, we segmented all 125 tracked listings in Amazon's live "medela 21mm flange" search results across the full price spectrum, and surfaced the top 3 price tiers by share below to highlight where competition concentrates and where pricing gaps exist.

Leading the distribution, the $10.00 ~ $20.00 band is the category's best medela 21mm flange price zone, absorbing 45% of the assortment (120 products) — this is where listing density is highest and where new entrants face the steepest competition for share-of-voice. Use the tier breakdown below to identify the top-ranking ASIN, monthly sales velocity, and rating profile within each band — essential inputs for pricing strategy, sourcing decisions, and competitive benchmarking in the medela 21mm flange category.

Top 3 Price Tiers

$10.00 ~ $20.00 is the most competitive price tier, containing 45% of tracked products.

Sweet Spot
$10.00 ~ $20.00
Tier 1
45%
120 products

Top products in this price tier

#1
B0CMPBBHMZ
$9.99
10k Units Sold/mo
Unlock Top Performers
#2
$0.00 ~ $10.00
Tier 2
34%
91 products
$20.00 ~ $50.00
Tier 3
13%
36 products
$50.00 ~ $100.00
5%
Unlock to view all price tier distributions and their ASIN sales contributions

"Medela 21mm flange" Search Volume and Market Trends on Amazon

Amazon keyword search volume data for "medela 21mm flange" in the US marketplace. This report provides insights into keyword search volume, Amazon search trends, competition levels, and conversion efficiency for sellers and brands.

During the week of 2026-06-28 to 2026-07-04, the Amazon USweekly search volume for "medela 21mm flange" was approximately 100 searches. The keyword currently holds an Amazon Search Frequency Rank (SFR) of #1,630,964, dropping 358,415 positions from the previous week. Additionally, the top 3 products for this keyword capture 81% of the total click share and 73.7% of the conversion share, indicating the level of market concentration.

Amazon Search Term
Weekly

medela 21mm flange

ASINSIGHT
Search Frequency Rank
1,630,964
358,415
Search Volume
100
24.8%
Top 3 Click Share
81%
Top 3 Conv. Share
73.7%

Search Volume Trend

Past 3 Years
Past 4 Months
Recent 8 months
Weekly Search Volume
100
View full trends for the past 3 years
JulAugSepOctNovDecJanFebMarAprMayJun

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