---
title: "Flange Insert — $607K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/baby-products/flange-insert"
last_updated: "2026-08-09T09:48:58.613Z"
locale: en
meta:
description: "Niche score 33/100 · $607K/yr market · 795K searches/yr · $9.25 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 33/100 · $607K/yr market · 795K searches/yr · $9.25 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Flange Insert — $607K/yr Amazon US Niche (2026) - Flapen"
---
# **flange insert**
**Skip it**
Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Market size 64Growth 20Conversion 80Competition 6Returns 49Price range 0Avg price 27Brand share 0Review moat 48Quality gap 32
**Conversion**
**Great****8.3%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Good****$607K**
$607K/yr · 795K searches
**Returns**
**Okay****3.1%**
return rate — above 5% kills the launch gate
**Review moat**
**Okay****1,674.43**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Avg price**
**Okay****$9.25**
avg listing price — sweet spot $15–$100
**Growth**
**Bad****-9.1%**
90-day search growth — must beat 0% to launch
**Competition**
**Bad****93%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
**Price range**
**Bad****$7.34–$10.05**
cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United States niche tracking, flange insert is a $607K/yr Amazon United States market (795K searches/yr). The top 5 brands hold 100% of demand. Verdict: Skip it — 33/100.
Data updated Jul 12, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **flange insert market data**
- **Units sold / yr**
- **60K–80K**
- avg 10,000–12,500/product
- **Revenue / yr**
- **$555K–$740K**
- units × avg price
- **Conversion rate**
- **8.3%**
- **Avg BSR**
- **#39**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **100%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **50 months**
- **Avg seller age**
- **152 days**
## **Competition & brand share**
The top 5 products capture 93% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**4 **▼falling
**Sellers**
**6**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**93%**
Top 20: 100%
**Open market**
**0%**
- Nuliie44% - Nursi Luna42% - LOTBILL7% - GOCROWEEN6% - Open — no brand owns it (0%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -9.1% search growth over the last 90 days.
18K13KSpike '24Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/us/baby-products/flange-insert/trend)
## **Top flange insert search terms**
- **flange inserts**135K/yr+67.7%7.2% conv. - **spectra flange inserts**106K/yr-13.0%9.2% conv. - **flange inserts for spectra**147K/yr-35.4%10.2% conv. - **breast pump flange insert**72K/yr-15.8%9.1% conv. - **flanges for breast pump**46K/yr-26.5%5.1% conv. - **silicone flange insert**30K/yr-20.5%6.0% conv. - **spectra s1 flange inserts**17K/yr+24.4%6.8% conv. - **flanges**25K/yr+0.9%2.9% conv. - **breast pump flange**23K/yr-5.8%3.8% conv. - **pump flange insert**20K/yr-3.1%9.1% conv. [**All search terms **](https://flapen.com/research/us/baby-products/flange-insert/search-terms)
## **Top flange insert products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%15%$91K30%$182K45%$273K60%$364K1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 7 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**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**Nuliie**$9.68**4.6★4,179 rev](https://www.amazon.com/dp/B0CMPBBHMZ) [2**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**Nursi Luna**$10.05**4.6★2,006 rev](https://www.amazon.com/dp/B0CKZH37FX) [3**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**Nursi Luna**$9.87**4.6★2,081 rev](https://www.amazon.com/dp/B0CY81WHD5) [4**Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Electric Breast Pump 24mm Flange/Shield Reduce 24mm Tunnel Down to Correct Size**LOTBILL**$7.34**4.6★583 rev](https://www.amazon.com/dp/B0CL96VP1C) [5**Flange Inserts 13/15/17/19/21mm 5pcs Suitable for Medela Spectra 24mm Shields/Flanges Compatible with Momcozy S12 Pro/S9 Pro/S9/S12 Wearable Breast Pump Reduce 24mm Tunnel Down to Correct Size**GOCROWEEN**$8.01**4.4★2,046 rev](https://www.amazon.com/dp/B0BKH4TX4J)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Nuliie 5-in-1 Flange Sizing Kit 12/14/16/18/20mm for 24mm Flange/Shield of Most Pumps 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort BPA-Free Pump Essential for Moms**Nuliie**$9.90**445 rev5mo ago](https://www.amazon.com/dp/B0GJRV3N1Q) [**Nursi Luna Flange Sizing Kit with 13/15/17/19/21mm for 24mm Electric Breast Pump Flanges/Shields 10PCS Soft Silicone Flange Inserts for Enhanced Pumping Comfort BPA-Free Pump Essential for Moms**Nursi Luna**$9.86**381 rev1y ago](https://www.amazon.com/dp/B0DT3QZ6Q2) [**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**Nursi Luna**$9.87**2,081 rev2y ago](https://www.amazon.com/dp/B0CY81WHD5) [**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**Nursi Luna**$10.05**2,006 rev2y ago](https://www.amazon.com/dp/B0CKZH37FX) [**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**Nuliie**$9.68**4,179 rev2y ago](https://www.amazon.com/dp/B0CMPBBHMZ)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Nuliie 5-in-1 Flange Sizing Kit 12/14/16/18/20mm for 24mm Flange/Shield of Most Pumps 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort BPA-Free Pump Essential for Moms**Nuliie**$9.90**4.5★**▲ 296%**](https://www.amazon.com/dp/B0GJRV3N1Q) [**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**Nursi Luna**$10.05**4.6★**▲ 71%**](https://www.amazon.com/dp/B0CKZH37FX) [**Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Electric Breast Pump 24mm Flange/Shield Reduce 24mm Tunnel Down to Correct Size**LOTBILL**$7.34**4.6★**▲ 23%**](https://www.amazon.com/dp/B0CL96VP1C) [**Flange Inserts 13/15/17/19/21mm 5pcs Suitable for Medela Spectra 24mm Shields/Flanges Compatible with Momcozy S12 Pro/S9 Pro/S9/S12 Wearable Breast Pump Reduce 24mm Tunnel Down to Correct Size**GOCROWEEN**$8.01**4.4★**— 1%**](https://www.amazon.com/dp/B0BKH4TX4J) [**Nursi Luna Flange Sizing Kit with 13/15/17/19/21mm for 24mm Electric Breast Pump Flanges/Shields 10PCS Soft Silicone Flange Inserts for Enhanced Pumping Comfort BPA-Free Pump Essential for Moms**Nursi Luna**$9.86**4.6★**▼ 17%**](https://www.amazon.com/dp/B0DT3QZ6Q2)
**~~View all trending →~~**
## **What buyers say about flange insert**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**32%
*“Like the sizer”*
**Quality-Overall**13%
*“One thing that really stood out to me was how well-made”*
**Ease Of Use**10%
*“This made it so easy for me”*
**Value For Money**9%
*“Good price”*
**Comfort-Overall**8%
*“So comfortable”*
**Ease Of Cleaning**5%
*“The little cleaning sponge is wonderful”*
**Breastfeeding Friendly**4%
*“Very helpful and useful for breastfeeding”*
**Advertised Vs Actual Product**4%
*“It performs exactly as intended”*
**Compatibility-Overall**3%
*“Compatible with Frida Mom manual pump”*
**Durability**3%
*“durable”*
### **What buyers complain about **
**Size-Overall**32%
*“Does NOT fit”*
**Quality-Overall**7%
*“Poor quality”*
**Compatibility-Overall**6%
*“Incompatible with Elvie Stride”*
**Ease Of Cleaning**6%
*“they are kind of a pain to insert and clean and the output isnt as good as just using the correct size pump accessory”*
**Durability**6%
*“one of the flange inserts tore right apart immediately after opening”*
**Comfort-Overall**5%
*“Very uncomfortable”*
**Value For Money**4%
*“Waste of money”*
**Functionality-Overall**2%
*“Doesnt work for me”*
**Defective Material/Parts**2%
*“Horrible product, pieces missing, and some pieces broken”*
**Instructions/User Manual/Troubleshooting**2%
*“Instructions were not clear instead they were confusing”*
### **Top return reasons **
**Size-Overall**54%
**Functionality-Overall**9%
**Advertised Vs Actual Product**7%
**Defective Material/Parts**5%
**Material Quality**4%
**Comfort-Overall**3%
**Breastfeeding Friendly**3%
**Value For Money**3%
**Compatibility-Overall**2%
**Quality-Overall**2%
## **Common questions**
- **Is flange insert profitable to sell on Amazon United States?**
- The niche generates $607K/yr across 7 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -9.1%. Flapen's verdict: Skip it (33/100).
- **How competitive is the flange insert niche?**
- 4 brands and 6 sellers compete. The top 5 products take 93% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in flange insert?**
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Compatibility-Overall. The return rate is 3.1%.
- **When does demand for flange insert peak?**
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- **What does it cost to enter the flange insert niche?**
- Listings span $7.34–$10.05; the average listing price is $9.25 (sweet spot $15–$100). The average incumbent carries 1,674 reviews — the moat a new listing must climb.
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