---
title: "13mm Flange Insert — $61K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/baby-products/13mm-flange-insert"
last_updated: "2026-08-09T03:39:34.264Z"
locale: en
meta:
description: "Niche score 44/100 · $61K/yr market · 36K searches/yr · $13.17 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 44/100 · $61K/yr market · 36K searches/yr · $13.17 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "13mm Flange Insert — $61K/yr Amazon US Niche (2026) - Flapen"
---
# **13mm flange insert**
**Skip it**
A small market ($61K/yr) — this niche doesn't clear our bar today.
Market size 15Growth 25Conversion 95Competition 59Returns 37Price range 68Avg price 60Brand share 40Review moat 39Quality gap 38
**Conversion**
**Incredible****12.8%**
search→purchase rate — share of searches ending in a sale
**Price range**
**Good****$6.83–$32.58**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Good****$13.17**
avg listing price — sweet spot $15–$100
**Competition**
**Good****49%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Okay****81%**
top-5 brand share — brands hold most of the demand
**Review moat**
**Okay****2,592.04**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Returns**
**Okay****4.0%**
return rate — above 5% kills the launch gate
**Growth**
**Okay****+0.2%**
90-day search growth — must beat 0% to launch
**Market size**
**Bad****$61K**
$61K/yr · 36K searches
According to Flapen's Amazon United States niche tracking, 13mm flange insert is a $61K/yr Amazon United States market (36K searches/yr). The top 5 brands hold 81% of demand. Verdict: Skip it — 44/100.
Data updated Jul 12, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **13mm flange insert market data**
- **Units sold / yr**
- **5K–6K**
- avg 100–250/product
- **Revenue / yr**
- **$66K–$79K**
- units × avg price
- **Conversion rate**
- **12.8%**
- **Avg BSR**
- **#73**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **88%**
- **Out of stock**
- **10.7%**
- **Avg brand age**
- **30 months**
- **Avg seller age**
- **203 days**
## **Competition & brand share**
The top 5 products take 49% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**14 **▲rising
**Sellers**
**21**
**Top-5 brand share**
**81%**
Top 20: 100%
**Top-5 click share**
**49%**
Top 20: 95%
**Open market**
**12%**
- Maymom35% - BDICOVE24% - IVARONAL7% - Momstouch7% - GOCROWEEN7% - CubCare7% - Open — no brand owns it (8 brands, 12%)
## **Top 13mm flange insert search terms**
- **13mm flange insert**12K/yr+15.4%12.7% conv. - **13 mm flange insert**9K/yr+0.4%13.2% conv. - **13mm flange spectra**6K/yr-9.9%16.6% conv. - **13mm flange**4K/yr+3.8%10.6% conv. - **13 mm flange spectra**4K/yr-22.8%20.3% conv. - **spectra flange 13mm**3K/yr-6.7%20.0% conv. [**All search terms **](https://flapen.com/research/us/baby-products/13mm-flange-insert/search-terms)
## **Top 13mm 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%4%$2K8%$5K12%$7K16%$10K1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**6Pcs Breast Pump Flange Insert 13mm 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**$8.87**4.5★253 rev](https://www.amazon.com/dp/B0F1SY2VR3) [2**Maymom 13mm Flange and Duckbill Valve Compatible with Spectra S1 Spectra S2 Spectra 9 Plus Not Original Spectra Pump Parts Replace Spectra S2 Pump Parts Spectra Flange Spectra Duckbill Valve**Maymom**$19.63**4.6★6,022 rev](https://www.amazon.com/dp/B0BLCXHT4N) [3**Maymom Flange Inserts 13 mm for Medela Spectra 24 mm Shields/Flanges Momcozy/Willow Wearable Cup. Compatible with Medela Freestyle Harmony to Reduce 24mm Nipple Tunnel Down to 13 mm; 2pc/Each**Maymom**$14.69**4.4★4,784 rev](https://www.amazon.com/dp/B0BNHRB1D3) [4**4Pcs Breast Pump Flange Insert 13mm 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/B0DS72J4G9) [5**Flange Inserts 13mm 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**$7.99**4.6★347 rev](https://www.amazon.com/dp/B0CM5R4G4S)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**6pcs Updated Silicone Flange Insert 13mm Compatible with Momcozy/Medela/Spectra/Eufy/Lansinoh/TSRETE/Elvie/NCVI/Paruu Breast Pump for 24mm Flange/Shield Breastfeeding Essential Replacement Pump Part**BDICOVE**$9.83**169 rev10mo ago](https://www.amazon.com/dp/B0FN3SGBSD) [**Flange Inserts for Spectra Spectra Replacement Pump Parts for S1/S2/9 Plus Not Original Accessories Breast Pump Parts Include 2-Pack 13MM Flanges and 4-Pack Duckbill Valves**CubCare**$9.94**119 rev11mo ago](https://www.amazon.com/dp/B0FM8VX83Z) [**Maymom Pump Parts Compatible with Spectra S2 S1 13mm Flange Valve Tube Bottle Backflow Protector Not Original Spectra S2 Replacement Pump Parts Duckbill Valve Bottle**Maymom**$32.58**9,124 rev1y ago](https://www.amazon.com/dp/B0F6N4NKTH) [**4PCS Flange Insert 13mm Compatible with Momcozy M5/M6/M9/S12 Pro/S9 Pro/V1 Pro/V2 Pro Spectra/Medela/Elvie/NCVI/TSRETE/eufy/Lansinoh/Paruu/MomMed Breast Pump 24mm Shields/Flanges**Opgroeie**$6.99**142 rev1y ago](https://www.amazon.com/dp/B0F313HXYJ) [**6Pcs Breast Pump Flange Insert 13mm 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**$8.87**253 rev1y ago](https://www.amazon.com/dp/B0F1SY2VR3)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Nenesupply 13mm Oval Flanges Compatible with Medela Breast Pump Parts Replace Medela Flange Accessories. Work with Pump in Style Parts Symphony Parts Swing Maxi Harmony and Personalfit Flex**NENESUPPLY**$14.61**4.4★**▲ 184%**](https://www.amazon.com/dp/B0G8DN8J2L) [**6pcs Updated Silicone Flange Insert 13mm Compatible with Momcozy/Medela/Spectra/Eufy/Lansinoh/TSRETE/Elvie/NCVI/Paruu Breast Pump for 24mm Flange/Shield Breastfeeding Essential Replacement Pump Part**BDICOVE**$9.83**4.2★**▲ 126%**](https://www.amazon.com/dp/B0FN3SGBSD) [**4Pcs Breast Pump Flange Insert 13mm 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★**▲ 115%**](https://www.amazon.com/dp/B0DS72J4G9) [**Momstouch 13mm Flange Compatible with Spectra S1 S2 9 Plus Synergy Gold Breastpump Replacement to Spectra Pump Parts and Spectra Flange; Not Original; Replaces Spectra Shield**Momstouch**$15.53**4.6★**▲ 49%**](https://www.amazon.com/dp/B0CM3NQMBT) [**Flange Inserts for Spectra Spectra Replacement Pump Parts for S1/S2/9 Plus Not Original Accessories Breast Pump Parts Include 2-Pack 13MM Flanges and 4-Pack Duckbill Valves**CubCare**$9.94**4.4★**▲ 48%**](https://www.amazon.com/dp/B0FM8VX83Z)
**~~View all trending →~~**
## **What buyers say about 13mm flange insert**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**32%
*“Good variety of sizes”*
**Quality-Overall**15%
*“One thing that really stood out to me was how well-made”*
**Value For Money**9%
*“Good product for price”*
**Comfort-Overall**8%
*“Comfortable”*
**Ease Of Cleaning**6%
*“The little cleaning sponge is wonderful”*
**Ease Of Use**6%
*“Easy to use”*
**Advertised Vs Actual Product**5%
*“Does the job as advertised”*
**Breastfeeding Friendly**4%
*“Very helpful and useful for breastfeeding”*
**Durability**4%
*“The quality feels durable”*
**Compatibility-Overall**3%
*“Compatible with Frida Mom manual pump”*
### **What buyers complain about **
**Size-Overall**30%
*“the 13 mm I ordered were WAY too small”*
**Compatibility-Overall**10%
*“Not compatible with Spectra”*
**Quality-Overall**7%
*“Would expect higher quality control from a company who is knowingly serving pregnant and postpartum women”*
**Durability**5%
*“one of the flange inserts tore right apart immediately after opening”*
**Value For Money**4%
*“Waste of money”*
**Leak-Proof**3%
*“Does not fully seal which causes my milk to spill back on me”*
**Comfort-Overall**3%
*“Very uncomfortable”*
**Thickness**3%
*“Thinner silicon at the breast”*
**Ease Of Cleaning**2%
*“Why did these come dirty”*
**Functionality-Overall**2%
*“Doesnt work for me”*
### **Top return reasons **
**Size-Overall**64%
**Functionality-Overall**7%
**Advertised Vs Actual Product**5%
**Defective Material/Parts**4%
**Material Quality**3%
**Comfort-Overall**3%
**Breastfeeding Friendly**2%
**Value For Money**2%
**Compatibility-Overall**2%
**Quality-Overall**2%
## **Common questions**
- **Is 13mm flange insert profitable to sell on Amazon United States?**
- The niche generates $61K/yr across 26 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is +0.2%. Flapen's verdict: Skip it (44/100).
- **How competitive is the 13mm flange insert niche?**
- 14 brands and 21 sellers compete. The top 5 products take 49% of clicks and top 5 brands hold 81% of demand.
- **What do buyers complain about in 13mm flange insert?**
- Top complaints mined from reviews: Size-Overall, Compatibility-Overall, Quality-Overall. The return rate is 4.0%.
- **What does it cost to enter the 13mm flange insert niche?**
- Listings span $6.83–$32.58; the average listing price is $13.17 (sweet spot $15–$100). The average incumbent carries 2,592 reviews — the moat a new listing must climb.
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