21mm Flange Insert
prices mostly outside the sweet spot ($6.92–$14.62) — 21mm Flange Insert doesn't clear our bar today.
Flapen Score
Ranks 2,297 of 2,472 Baby Products niches · −16 vs the category median of 44
Is 21mm Flange Insert profitable on Amazon?
According to Flapen's Amazon United States niche tracking, 21mm Flange Insert is a $53K/yr Amazon United States market (40K searches/yr). The top 5 brands hold 93% of demand. Verdict: Skip it — 28/100.
21mm Flange Insert: the Amazon niche in one read
Everything a seller checks before entering, in three answers.
Is the demand real?
Not really. Search demand moved -7.5% over the last 90 days and 14.6% of searches end in a purchase.
$53K
revenue / yr
Who owns the niche?
The top 5 brands hold 93% of demand, so 7% of the market is open.
7%
open market share
Is there a way in?
Listing quality. The average product page scores 0/100 on content standards. Incumbents average 4.5★ — the gap to enter on.
0/100
page quality · 7 products
Top 21mm Flange Insert products & what they sell for
Every tracked product — its share of the shelf, its review moat, and what it sells for.
Top sellers
by 90-day click share
Flange Inserts 21mm Compatible with Medela/Spectra/TSRETE/Elvie/Momcozy/Bellababy Breast Pump 24mm Shields/Flanges Reduce 24mm Nipple Tunnel Down to 21 mm 4PCS
- Price
- $7.97
- Rating
- 4.5/5
- Reviews
- 971
- Age
- 2y ago
21mm Flange Insert 6PC Compatible with 21mm Flange Spectra/Flange Inserts for Spectra Flange 21mm/Momcozy Wearable Breast Pump Flange Insert/Medela Flange 21mm/Elvie/Willow/TSRETE
- Price
- $9.88
- Rating
- 4.5/5
- Reviews
- 562
- Age
- 2y ago
4Pcs Breast Pump Flange Insert 21mm Compatible with Momcozy/Spectra/Medela/eufy/Elvie/Lansinoh/Paruu P10 Breast Pump Fit for Momcozy M5/M9/M6/V2 Pro/V2 pro/S12 Pro/eufy E10 S1 S1 Pro 24mm Flange
- Price
- $7.84
- Rating
- 4.5/5
- Reviews
- 635
- Age
- 1y ago
Flange Inserts 21mm 8PC Compatible with Momcozy S12 pro/S9 pro/S9/S10/S12/Medela/TSRETE/Spectra/Bellababy etc 24mm Wearable Breast Pump Reduce 24mm Tunnel Down to Correct Size
- Price
- $7.96
- Rating
- 4.6/5
- Reviews
- 347
- Age
- 2y ago
Maymom Flange 21mm Insert Compatible with Medela/Spectra/Elvie/momcozy/tsrete/Willow/Motif Luna/Ameda MYA Breastpump 24mm Breast Shields. Reduce 24mm Niple Tunnel Down to 21mm
- Price
- $14.62
- Rating
- 4.5/5
- Reviews
- 3,517
- Age
- 3y ago
Trending
90-day click momentumFlange Inserts 21mm 8PC Compatible with Momcozy S12 pro/S9 pro/S9/S10/S12/Medela/TSRETE/Spectra/Bellababy etc 24mm Wearable Breast Pump Reduce 24mm Tunnel Down to Correct Size
- Price
- $7.96
- Rating
- 4.6/5
- Reviews
- 347
- Age
- 2y ago
4Pcs Breast Pump Flange Insert 21mm Compatible with Momcozy/Spectra/Medela/eufy/Elvie/Lansinoh/Paruu P10 Breast Pump Fit for Momcozy M5/M9/M6/V2 Pro/V2 pro/S12 Pro/eufy E10 S1 S1 Pro 24mm Flange
- Price
- $7.84
- Rating
- 4.5/5
- Reviews
- 635
- Age
- 1y ago
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
- Price
- $9.68
- Rating
- 4.6/5
- Reviews
- 4,179
- Age
- 2y ago
21mm Flange Insert 6PC Compatible with 21mm Flange Spectra/Flange Inserts for Spectra Flange 21mm/Momcozy Wearable Breast Pump Flange Insert/Medela Flange 21mm/Elvie/Willow/TSRETE
- Price
- $9.88
- Rating
- 4.5/5
- Reviews
- 562
- Age
- 2y ago
Flange Inserts 21mm Compatible with Medela/Spectra/TSRETE/Elvie/Momcozy/Bellababy Breast Pump 24mm Shields/Flanges Reduce 24mm Nipple Tunnel Down to 21 mm 4PCS
- Price
- $7.97
- Rating
- 4.5/5
- Reviews
- 971
- Age
- 2y ago
Newest
by launch date4Pcs Breast Pump Flange Insert 21mm Compatible with Momcozy/Spectra/Medela/eufy/Elvie/Lansinoh/Paruu P10 Breast Pump Fit for Momcozy M5/M9/M6/V2 Pro/V2 pro/S12 Pro/eufy E10 S1 S1 Pro 24mm Flange
- Price
- $7.84
- Rating
- 4.5/5
- Reviews
- 635
- Age
- 1y ago
IVARONAL Flange Insert 2PCS 21mm Compatible with Momcozy M9/M6/M5/S12 Pro/V1 Pro/V2 pro Spectra/Medela/Elvie/NCVI/TSRETE/eufy/Lansinoh/Paruu/MomMed Breast Pump 24mm Shields/Flanges (2pcs-21mm)
- Price
- $6.92
- Rating
- 4.5/5
- Reviews
- 848
- Age
- 2y ago
Flange Inserts 21mm Compatible with Medela/Spectra/TSRETE/Elvie/Momcozy/Bellababy Breast Pump 24mm Shields/Flanges Reduce 24mm Nipple Tunnel Down to 21 mm 4PCS
- Price
- $7.97
- Rating
- 4.5/5
- Reviews
- 971
- Age
- 2y ago
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
- Price
- $9.68
- Rating
- 4.6/5
- Reviews
- 4,179
- Age
- 2y ago
21mm Flange Insert 6PC Compatible with 21mm Flange Spectra/Flange Inserts for Spectra Flange 21mm/Momcozy Wearable Breast Pump Flange Insert/Medela Flange 21mm/Elvie/Willow/TSRETE
- Price
- $9.88
- Rating
- 4.5/5
- Reviews
- 562
- Age
- 2y ago
Competition: brands, sellers & click share
The top 5 products capture 93% of clicks — a locked-up shelf that new listings rarely crack.
Brands
7 falling
Sellers
9
Top-5 brand share
93%
Top 20: 100%
Top-5 click share
93%
Top 20: 100%
Open market
3%
- Suniceme53%
- Hranio24%
- BDICOVE6%
- GOCROWEEN6%
- Maymom4%
- Nuliie4%
- Open — no brand owns it (1 brand, 3%)
21mm Flange Insert demand & seasonality
Weekly search volume, with the niche's key stats alongside.
No pronounced peak months · busiest ÷ quietest = 1.4×
Top 21mm Flange Insert search terms shoppers use
The exact queries shoppers type, with yearly volume, growth and conversion.
- 21mm flange insert22K/yr
- 21 mm flange insert14K/yr
- 21 flange inserts3K/yr
What reviews say buyers love and hate about 21mm Flange Insert
What buyers mention most, as a share of all reviews.
What buyers love
87% of reviews“The best sizing kit”
“One thing that really stood out to me was how well-made”
“Great price”
“are very comfy”
“The little cleaning sponge is wonderful”
What buyers complain about
69% of reviews“Not true size”
“Poor quality”
“one of the flange inserts tore right apart immediately after opening”
“Waste of money”
“Not comfortable”
21mm Flange Insert return rate & reasons
Why buyers send it back, as a share of all return requests.
4.8%
Return rate
72%
Fixable by listing
The "fixable" share counts expectation-mismatch reasons — size, look, advertised-vs-actual — that better copy and images address.
Common 21mm Flange Insert questions
The questions sellers ask about this niche, answered from the tracked metrics.
Related niches
Same-category niches scoring near this one — the next ones worth researching.
Best Flapen score
The highest-scoring niches we track right now, across every category.
