---
title: "13mm flange insert — Niche Verdict: Skip it (45/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/baby-products/13mm-flange-insert"
last_updated: "2026-07-14T05:06:38.894Z"
locale: en
meta:
  description: "a small market ($61K/yr) — 13mm flange insert doesn't clear our bar today."
  "og:description": "a small market ($61K/yr) — 13mm flange insert doesn't clear our bar today."
  "og:title": "13mm flange insert — Niche Verdict: Skip it (45/100) | Amazon United States - Flapen"
---

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# **13mm flange insert**

**Skip it**

A small market ($61K/yr) — this niche doesn't clear our bar today.

Market size 15Growth 25Conversion 95Competition 59Returns 41Price 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

**Returns**

**Okay****4.0%**

return rate — above 6% kills the launch gate

**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

**Growth**

**Okay****+0.2%**

90-day search growth — must beat 0% to launch

**Market size**

**Bad****$61K**

$61K/yr · 36K searches

## **Competition**

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%**

**Open market**

**12%**

- Maymom35% - BDICOVE24% - IVARONAL7% - Momstouch7% - GOCROWEEN7% - CubCare7% - Open — no brand owns it (8 brands, 12%)

## **Product shelf**

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%$10K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 26 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](https://m.media-amazon.com/images/I/31AVjDYLVzL.jpg)**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](https://m.media-amazon.com/images/I/31wB1XO+-YL.jpg)**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](https://m.media-amazon.com/images/I/21TOCvnjorL.jpg)**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](https://m.media-amazon.com/images/I/41Mk6oFIdBL.jpg)**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](https://m.media-amazon.com/images/I/31lCYaIC-mL.jpg)**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

[![13mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Include 2-Pack 13MM Flanges and 4-Pack Duckbill Valves Not Original Replace Accessories](https://m.media-amazon.com/images/I/31SVM5+iTUL.jpg)**13mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Include 2-Pack 13MM Flanges and 4-Pack Duckbill Valves Not Original Replace Accessories**KAIYIV**$10.45**21 rev6mo ago](https://www.amazon.com/dp/B0GCCR611G) [![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](https://m.media-amazon.com/images/I/410vRlZLzQL.jpg)**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](https://m.media-amazon.com/images/I/41eJnx1XVPL.jpg)**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](https://m.media-amazon.com/images/I/41tJ2WHNpiL.jpg)**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](https://m.media-amazon.com/images/I/31sdz2P5OzL.jpg)**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)

**~~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](https://m.media-amazon.com/images/I/41P5If0Ql-L.jpg)**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](https://m.media-amazon.com/images/I/410vRlZLzQL.jpg)**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](https://m.media-amazon.com/images/I/41Mk6oFIdBL.jpg)**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](https://m.media-amazon.com/images/I/41qxwzbuXWL.jpg)**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](https://m.media-amazon.com/images/I/41eJnx1XVPL.jpg)**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 →~~**

## **Reviews**

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%