---
title: "20mm flange insert — Niche Verdict: Skip it (33/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/baby-products/20mm-flange-insert"
last_updated: "2026-07-14T05:06:38.107Z"
locale: en
meta:
  description: "brand-locked demand (top 5 brands take 98% of clicks) — 20mm flange insert doesn't clear our bar today."
  "og:description": "brand-locked demand (top 5 brands take 98% of clicks) — 20mm flange insert doesn't clear our bar today."
  "og:title": "20mm flange insert — Niche Verdict: Skip it (33/100) | Amazon United States - Flapen"
---

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# **20mm flange insert**

**Skip it**

Brand-locked demand (top 5 brands take 98% of clicks) — this niche doesn't clear our bar today.

Market size 29Growth 18Conversion 96Competition 9Returns 26Price range 74Avg price 81Brand share 4Review moat 32Quality gap 30

**Conversion**

**Incredible****14.2%**

search→purchase rate — share of searches ending in a sale

**Avg price**

**Great****$17.28**

avg listing price — sweet spot $15–$100

**Price range**

**Good****$8.78–$32.49**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Review moat**

**Okay****3,288.56**

avg incumbent reviews — the moat a new listing must climb

**Quality gap**

**Okay****4.6★**

avg incumbent rating — lower means beatable quality

**Market size**

**Okay****$125K**

$125K/yr · 51K searches

**Returns**

**Okay****5.9%**

return rate — above 6% kills the launch gate

**Growth**

**Bad****-14.7%**

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

**Competition**

**Bad****89%**

top-5 click share — a locked-up shelf

**Brand share**

**Bad****98%**

top-5 brand share — brand-locked demand

## **Competition**

The top 5 products capture 89% of clicks — a locked-up shelf that new listings rarely crack.

**Brands**

**6 **—flat

**Sellers**

**12**

**Top-5 brand share**

**98%**

**Open market**

**0%**

- Maymom37% - SPECTRA31% - Momstouch24% - MOOMentaneous5% - TOVVILD2% - Gotocut2%

## **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%10%$12K20%$25K30%$37K40%$50K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

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

All 9 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![Spectra Baby USA - Single Breast Flange - Small / 20mm](https://m.media-amazon.com/images/I/31IPU7BRtCL.jpg)**Spectra Baby USA - Single Breast Flange - Small / 20mm**SPECTRA**$14.39**4.8★3,902 rev](https://www.amazon.com/dp/B07CNT9XSP) [2![Maymom 20 mm 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/41ubpTXdeML.jpg)**Maymom 20 mm 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**$19.53**4.6★6,022 rev](https://www.amazon.com/dp/B0BL116P5H) [3![Momstouch 20mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts Not Original Replace Accessories.](https://m.media-amazon.com/images/I/41dUzNkXTdL.jpg)**Momstouch 20mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts Not Original Replace Accessories.**Momstouch**$16.64**4.3★592 rev](https://www.amazon.com/dp/B0CKQJPVPL) [4![Maymom Wide Neck Pump Part for Spectra S1/S2 Pumps; Incl Wide Mouth Flange; Not Original Spectra Flange; Replaces Spectra Shield (20 mm Two Flanges)](https://m.media-amazon.com/images/I/41ttP1cGesL.jpg)**Maymom Wide Neck Pump Part for Spectra S1/S2 Pumps; Incl Wide Mouth Flange; Not Original Spectra Flange; Replaces Spectra Shield (20 mm Two Flanges)**Maymom**$16.72**4.7★7,932 rev](https://www.amazon.com/dp/B0922S3Z6W) [5![MOOMentaneous 20mm Flange and Duckbill Valve Compatible with Spectra S1/S2 and 9 Plus Not Original Spectra Pump Parts Replacement](https://m.media-amazon.com/images/I/41wetgZY9UL.jpg)**MOOMentaneous 20mm Flange and Duckbill Valve Compatible with Spectra S1/S2 and 9 Plus Not Original Spectra Pump Parts Replacement**MOOMentaneous**$12.55**4.6★111 rev](https://www.amazon.com/dp/B0DJ2MZ2CX)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![Gotocut 20mm Flange Kit Compatible with Spectra S1/S2/9 Plus/Motif Luna Includes Flange 20mm Bottles Tubing Valves and Backflow Protectors](https://m.media-amazon.com/images/I/41V8hwrDpgL.jpg)**Gotocut 20mm Flange Kit Compatible with Spectra S1/S2/9 Plus/Motif Luna Includes Flange 20mm Bottles Tubing Valves and Backflow Protectors**Gotocut**$18.80**74 rev1y ago](https://www.amazon.com/dp/B0FGXWVND6) [![MOOMentaneous 20mm Flange and Duckbill Valve Compatible with Spectra S1/S2 and 9 Plus Not Original Spectra Pump Parts Replacement](https://m.media-amazon.com/images/I/41wetgZY9UL.jpg)**MOOMentaneous 20mm Flange and Duckbill Valve Compatible with Spectra S1/S2 and 9 Plus Not Original Spectra Pump Parts Replacement**MOOMentaneous**$12.55**111 rev1y ago](https://www.amazon.com/dp/B0DJ2MZ2CX) [![TOVVILD 20mm Flange Inserts for 24mm Flange/Shield Compatible with Momcozy/Medela/MOMMED/Spectra Breast Pumps Pump Parts Replace (4PCS 20mm)](https://m.media-amazon.com/images/I/41K-CKpCrrL.jpg)**TOVVILD 20mm Flange Inserts for 24mm Flange/Shield Compatible with Momcozy/Medela/MOMMED/Spectra Breast Pumps Pump Parts Replace (4PCS 20mm)**TOVVILD**$8.78**1,539 rev2y ago](https://www.amazon.com/dp/B0CSFKZGTJ) [![Momstouch 20mm Flange Compatible with Spectra S1 S2 9 Plus Synergy Gold Breastpump Replacement to Spectra Pump Parts and Flange; Not Original; Replaces Shield](https://m.media-amazon.com/images/I/41sNP4rdzPL.jpg)**Momstouch 20mm Flange Compatible with Spectra S1 S2 9 Plus Synergy Gold Breastpump Replacement to Spectra Pump Parts and Flange; Not Original; Replaces Shield**Momstouch**$15.60**301 rev2y ago](https://www.amazon.com/dp/B0CM61RWS1) [![Momstouch 20mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts Not Original Replace Accessories.](https://m.media-amazon.com/images/I/41dUzNkXTdL.jpg)**Momstouch 20mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts Not Original Replace Accessories.**Momstouch**$16.64**592 rev2y ago](https://www.amazon.com/dp/B0CKQJPVPL)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![MOOMentaneous 20mm Flange and Duckbill Valve Compatible with Spectra S1/S2 and 9 Plus Not Original Spectra Pump Parts Replacement](https://m.media-amazon.com/images/I/41wetgZY9UL.jpg)**MOOMentaneous 20mm Flange and Duckbill Valve Compatible with Spectra S1/S2 and 9 Plus Not Original Spectra Pump Parts Replacement**MOOMentaneous**$12.55**4.6★**▲ 92%**](https://www.amazon.com/dp/B0DJ2MZ2CX) [![Maymom Pump Parts Compatible with Spectra S2 S1 20mm Flange Valve Tube Bottle Backflow Protector Not Original Spectra S2 Replacement Pump Parts Duckbill Valve Bottle](https://m.media-amazon.com/images/I/41zAu9gEmXS.jpg)**Maymom Pump Parts Compatible with Spectra S2 S1 20mm Flange Valve Tube Bottle Backflow Protector Not Original Spectra S2 Replacement Pump Parts Duckbill Valve Bottle**Maymom**$32.49**4.6★**▲ 52%**](https://www.amazon.com/dp/B098D7F672) [![Gotocut 20mm Flange Kit Compatible with Spectra S1/S2/9 Plus/Motif Luna Includes Flange 20mm Bottles Tubing Valves and Backflow Protectors](https://m.media-amazon.com/images/I/41V8hwrDpgL.jpg)**Gotocut 20mm Flange Kit Compatible with Spectra S1/S2/9 Plus/Motif Luna Includes Flange 20mm Bottles Tubing Valves and Backflow Protectors**Gotocut**$18.80**4.5★**▲ 49%**](https://www.amazon.com/dp/B0FGXWVND6) [![Spectra Baby USA - Single Breast Flange - Small / 20mm](https://m.media-amazon.com/images/I/31IPU7BRtCL.jpg)**Spectra Baby USA - Single Breast Flange - Small / 20mm**SPECTRA**$14.39**4.8★**▲ 14%**](https://www.amazon.com/dp/B07CNT9XSP) [![Momstouch 20mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts Not Original Replace Accessories.](https://m.media-amazon.com/images/I/41dUzNkXTdL.jpg)**Momstouch 20mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts Not Original Replace Accessories.**Momstouch**$16.64**4.3★**— 0%**](https://www.amazon.com/dp/B0CKQJPVPL)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 102 weeks — -14.7% search growth over the last 90 days.

1K800 seasonDecMarJunAugNovMarMay

No pronounced peak months · busiest ÷ quietest = 1.2×

## **Reviews**

What buyers praise and complain about, mined from review topics.

### **What buyers love **

**Size-Overall**22%

*“Perfect Fit”*

**Breastfeeding Friendly**15%

*“Works great with my Spectra breast pump”*

**Value For Money**15%

*“I have ordered this twice because I love the price point”*

**Quality-Overall**15%

*“Good quality”*

**Advertised Vs Actual Product**14%

*“Works as intended”*

**Sun Protection**8%

*“Does the job though it has low sunction”*

**Comfort-Overall**4%

*“have made pumping so much more comfortable”*

**Ease Of Cleaning**3%

*“I got these to have multiple sets so I don't have to wash after every use”*

### **What buyers complain about **

**Functionality-Overall**20%

*“Non functional”*

**Compatibility-Overall**15%

*“Not compatible with SpectraS1”*

**Size-Overall**15%

*“Didn't fit at all”*

**Leak-Proof**10%

*“resulting in spilled milk both times”*

**Quality-Overall**10%

*“Poor quality”*

**Noise Level**10%

*“It makes noises like air is escaping”*

**Durability**5%

*“When the same piece broke again on the second set”*

**Ease Of Use**5%

*“Unfortunately I cant use them”*

### **Top return reasons **

**Size-Overall**81%

**Width**6%

**Advertised Vs Actual Product**3%

**Functionality-Overall**2%

**Defective Material/Parts**2%

**Value For Money**1%

**Compatibility-Overall**1%

**Connectivity-Overall**1%

**Product Condition**1%

**Breastfeeding Friendly**0%