---
title: "19mm Flange Inserts — $120K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/baby-products/19mm-flange-inserts"
last_updated: "2026-08-09T03:17:29.805Z"
locale: en
meta:
description: "Niche score 34/100 · $120K/yr market · 66K searches/yr · $10.36 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 34/100 · $120K/yr market · 66K searches/yr · $10.36 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "19mm Flange Inserts — $120K/yr Amazon US Niche (2026) - Flapen"
---
# **19mm flange inserts**
**Skip it**
Prices mostly outside the sweet spot ($7.90–$14.73) — this niche doesn't clear our bar today.
Market size 28Growth 25Conversion 99Competition 16Returns 29Price range 0Avg price 36Brand share 18Review moat 47Quality gap 45
**Conversion**
**Incredible****17.6%**
search→purchase rate — share of searches ending in a sale
**Review moat**
**Okay****1,826.9**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Avg price**
**Okay****$10.36**
avg listing price — sweet spot $15–$100
**Returns**
**Okay****4.7%**
return rate — above 5% kills the launch gate
**Market size**
**Okay****$120K**
$120K/yr · 66K searches
**Growth**
**Bad****-0.0%**
90-day search growth — must beat 0% to launch
**Brand share**
**Bad****93%**
top-5 brand share — brand-locked demand
**Competition**
**Bad****81%**
top-5 click share — a locked-up shelf
**Price range**
**Bad****$7.90–$14.73**
cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United States niche tracking, 19mm flange inserts is a $120K/yr Amazon United States market (66K searches/yr). The top 5 brands hold 93% of demand. Verdict: Skip it — 34/100.
Data updated Jul 12, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **19mm flange inserts market data**
- **Units sold / yr**
- **10K–13K**
- avg 1,000–1,250/product
- **Revenue / yr**
- **$104K–$130K**
- units × avg price
- **Conversion rate**
- **17.6%**
- **Avg BSR**
- **#52**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **100%**
- **Out of stock**
- **10.3%**
- **Avg brand age**
- **33 months**
- **Avg seller age**
- **149 days**
## **Competition & brand share**
The top 5 products capture 81% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**7 **▼falling
**Sellers**
**10**
**Top-5 brand share**
**93%**
Top 20: 100%
**Top-5 click share**
**81%**
Top 20: 100%
**Open market**
**3%**
- Suniceme48% - BDICOVE13% - Hranio13% - GOCROWEEN11% - Maymom8% - Momcozy4% - Open — no brand owns it (1 brand, 3%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -0.0% search growth over the last 90 days.
2K1KSpike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.5×
[**Open Trend **](https://flapen.com/research/us/baby-products/19mm-flange-inserts/trend)
## **Top 19mm flange inserts search terms**
- **19mm flange inserts**37K/yr-7.1%14.9% conv. - **19 mm flange inserts**19K/yr+8.4%14.8% conv. - **size 19 flange inserts**4K/yr+11.0%15.9% conv. - **flange inserts 19mm**3K/yr+36.0%12.6% conv. - **19mm flange insert**3K/yr-17.4%15.3% conv. [**All search terms **](https://flapen.com/research/us/baby-products/19mm-flange-inserts/search-terms)
## **Top 19mm flange inserts 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%$18K30%$36K45%$54K60%$72K1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 10 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Flange Inserts 19mm Compatible with Medela/Spectra/TSRETE/Elvie/Momcozy/Bellababy Breast Pump 24mm Shields/Flanges Reduce 24mm Nipple Tunnel Down to 19 mm 4PCS**Suniceme**$8.00**4.5★971 rev](https://www.amazon.com/dp/B0CW1WG42M) [2**Flange Insert 19mm 6pcs Flange Sizing Kit Compatible with Spectra Flange Spectra Pump Parts Momcozy Wearable Breast Pump Manual Breast Pump Spectra Breast Pump Medela Pump Parts and More**Hranio**$9.90**4.5★371 rev](https://www.amazon.com/dp/B0CNYVSJWL) [3**4Pcs Breast Pump Flange Insert 19mm 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**BDICOVE**$7.90**4.5★635 rev](https://www.amazon.com/dp/B0DS6YWTCF) [4**Flange Inserts 19mm 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**GOCROWEEN**$7.98**4.6★347 rev](https://www.amazon.com/dp/B0CM5Q7FV6) [5**Flange Inserts 19mm for Medela Spectra 24mm Shields/Flanges Compatible with Momcozy S12 Pro/S9 Pro/S9/S12 Wearable Breast Pump Reduce 24mm Nipple Tunnel Down to 19mm 10PCS**GOCROWEEN**$9.94**4.4★2,046 rev](https://www.amazon.com/dp/B0D37SXGKG)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Momcozy Flange Insert 19mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS 19mm**Momcozy**$12.02**1,166 rev5mo ago](https://www.amazon.com/dp/B0G2WWRBDV) [**6Pcs Breast Pump Flange Insert 19mm 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**BDICOVE**$8.78**253 rev1y ago](https://www.amazon.com/dp/B0F1T6Q5P1) [**4Pcs Breast Pump Flange Insert 19mm 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**BDICOVE**$7.90**635 rev1y ago](https://www.amazon.com/dp/B0DS6YWTCF) [**Flange Inserts 19mm for Medela Spectra 24mm Shields/Flanges Compatible with Momcozy S12 Pro/S9 Pro/S9/S12 Wearable Breast Pump Reduce 24mm Nipple Tunnel Down to 19mm 10PCS**GOCROWEEN**$9.94**2,046 rev2y ago](https://www.amazon.com/dp/B0D37SXGKG) [**Flange Inserts 19mm Compatible with Medela/Spectra/TSRETE/Elvie/Momcozy/Bellababy Breast Pump 24mm Shields/Flanges Reduce 24mm Nipple Tunnel Down to 19 mm 4PCS**Suniceme**$8.00**971 rev2y ago](https://www.amazon.com/dp/B0CW1WG42M)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**6Pcs Breast Pump Flange Insert 19mm 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**BDICOVE**$8.78**4.5★**▲ 216%**](https://www.amazon.com/dp/B0F1T6Q5P1) [**Flange Inserts 19mm for Medela Spectra 24mm Shields/Flanges Compatible with Momcozy S12 Pro/S9 Pro/S9/S12 Wearable Breast Pump Reduce 24mm Nipple Tunnel Down to 19mm 10PCS**GOCROWEEN**$9.94**4.4★**▲ 170%**](https://www.amazon.com/dp/B0D37SXGKG) [**Momcozy Flange Insert 19mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS 19mm**Momcozy**$12.02**4.3★**▲ 99%**](https://www.amazon.com/dp/B0G2WWRBDV) [**4Pcs Breast Pump Flange Insert 19mm 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**BDICOVE**$7.90**4.5★**▲ 21%**](https://www.amazon.com/dp/B0DS6YWTCF) [**Flange Inserts 19mm 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**GOCROWEEN**$7.98**4.6★**▲ 11%**](https://www.amazon.com/dp/B0CM5Q7FV6)
**~~View all trending →~~**
## **What buyers say about 19mm flange inserts**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**31%
*“The sizing was accurate”*
**Quality-Overall**18%
*“High quality loved the storage case”*
**Value For Money**8%
*“Great price”*
**Comfort-Overall**8%
*“are very comfy”*
**Ease Of Cleaning**7%
*“The little cleaning sponge is wonderful”*
**Ease Of Use**4%
*“was easy to use”*
**Advertised Vs Actual Product**4%
*“It performs exactly as intended”*
**Breastfeeding Friendly**4%
*“Very helpful and useful for breastfeeding”*
**Durability**3%
*“Very durable”*
**Compatibility-Overall**2%
*“Compatible with spectra pumps”*
### **What buyers complain about **
**Size-Overall**29%
*“These are huge”*
**Quality-Overall**9%
*“Would expect higher quality control from a company who is knowingly serving pregnant and postpartum women”*
**Functionality-Overall**7%
*“Doesnt work for me”*
**Durability**6%
*“one of the flange inserts tore right apart immediately after opening”*
**Value For Money**6%
*“Waste of money”*
**Adhesion/Stickiness**4%
*“Too sticky; nipple can move”*
**Ease Of Use**4%
*“Semi-useful”*
**Defective Material/Parts**4%
*“Horrible product, pieces missing, and some pieces broken”*
**Compatibility-Overall**4%
*“Not compatible with Spectra”*
**Instructions/User Manual/Troubleshooting**4%
*“Instructions were not clear instead they were confusing”*
### **Top return reasons **
**Size-Overall**62%
**Functionality-Overall**7%
**Advertised Vs Actual Product**5%
**Material Quality**5%
**Defective Material/Parts**4%
**Value For Money**2%
**Breastfeeding Friendly**2%
**Width**2%
**Comfort-Overall**2%
**Compatibility-Overall**2%
## **Common questions**
- **Is 19mm flange inserts profitable to sell on Amazon United States?**
- The niche generates $120K/yr across 10 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -0.0%. Flapen's verdict: Skip it (34/100).
- **How competitive is the 19mm flange inserts niche?**
- 7 brands and 10 sellers compete. The top 5 products take 81% of clicks and top 5 brands hold 93% of demand.
- **What do buyers complain about in 19mm flange inserts?**
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Functionality-Overall. The return rate is 4.7%.
- **When does demand for 19mm flange inserts peak?**
- Demand is steady year-round — the busiest month runs 1.5× the quietest.
- **What does it cost to enter the 19mm flange inserts niche?**
- Listings span $7.90–$14.73; the average listing price is $10.36 (sweet spot $15–$100). The average incumbent carries 1,827 reviews — the moat a new listing must climb.
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