---
title: "18mm flange spectra — Niche Verdict: Skip it (39/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/baby-products/18mm-flange-spectra"
last_updated: "2026-07-14T00:25:31.127Z"
locale: en
meta:
  description: "brand-locked demand (top 5 brands take 98% of clicks) — 18mm flange spectra doesn't clear our bar today."
  "og:description": "brand-locked demand (top 5 brands take 98% of clicks) — 18mm flange spectra doesn't clear our bar today."
  "og:title": "18mm flange spectra — Niche Verdict: Skip it (39/100) | Amazon United States - Flapen"
---

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# **18mm flange spectra**

**Skip it**

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

Market size 45Growth 22Conversion 99Competition 23Returns 26Price range 68Avg price 66Brand share 6Review moat 31Quality gap 38

**Conversion**

**Incredible****17.7%**

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

**Price range**

**Good****$6.90–$32.51**

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

**Avg price**

**Good****$13.96**

avg listing price — sweet spot $15–$100

**Market size**

**Okay****$241K**

$241K/yr · 98K searches

**Quality gap**

**Okay****4.5★**

avg incumbent rating — lower means beatable quality

**Review moat**

**Okay****3,411.31**

avg incumbent reviews — the moat a new listing must climb

**Returns**

**Okay****5.9%**

return rate — above 6% kills the launch gate

**Competition**

**Bad****73%**

top-5 click share — a locked-up shelf

**Growth**

**Bad****-6.5%**

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

**Brand share**

**Bad****98%**

top-5 brand share — brand-locked demand

## **Competition**

The top 5 products capture 73% of clicks — a locked-up shelf that new listings rarely crack.

**Brands**

**6 **▼falling

**Sellers**

**8**

**Top-5 brand share**

**98%**

**Open market**

**0%**

- Maymom49% - BDICOVE19% - Momstouch15% - TOVVILD9% - MOOMentaneous6% - IVARONAL2% - Open — no brand owns it (0%)

## **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%$24K20%$48K30%$72K40%$96K1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

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

All 13 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![Maymom 18mm 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/416VZYzpuxL.jpg)**Maymom 18mm 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**$19.74**4.6★6,022 rev](https://www.amazon.com/dp/B0BLCYPBG7) [2![4Pcs Breast Pump Flange Insert 18mm 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/41CLsuY9GCL.jpg)**4Pcs Breast Pump Flange Insert 18mm 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**$7.92**4.5★635 rev](https://www.amazon.com/dp/B0DS6Y163F) [3![Momstouch 18mm 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/41i9lT7BpML.jpg)**Momstouch 18mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts Not Original Replace Accessories.**Momstouch**$16.77**4.3★592 rev](https://www.amazon.com/dp/B0CKQJ5YF3) [4![Maymom 18mm Wide Neck Pump Part Compatible with Spectra S1/S2 Pumps; Incl Wide Mouth Flange; Not Original Spectra Flange; Replaces Shield; Compatible with Motif Luna Pumps](https://m.media-amazon.com/images/I/412Vy3hElRL.jpg)**Maymom 18mm Wide Neck Pump Part Compatible with Spectra S1/S2 Pumps; Incl Wide Mouth Flange; Not Original Spectra Flange; Replaces Shield; Compatible with Motif Luna Pumps**Maymom**$17.62**4.7★7,932 rev](https://www.amazon.com/dp/B0BJZR6749) [5![18mm Flange Inserts for 24mm Flange/Shield Compatible with Momcozy/Medela/MOMMED/Bellababy/Spectra Breast Pumps Pump Parts Replace (4PCS 18mm)](https://m.media-amazon.com/images/I/41Lx0ui72TL.jpg)**18mm Flange Inserts for 24mm Flange/Shield Compatible with Momcozy/Medela/MOMMED/Bellababy/Spectra Breast Pumps Pump Parts Replace (4PCS 18mm)**TOVVILD**$8.87**4.4★1,539 rev](https://www.amazon.com/dp/B0CSFMRMHD)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![6pcs Updated Silicone Flange Insert 18mm 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/4101cEgIr9L.jpg)**6pcs Updated Silicone Flange Insert 18mm Compatible with Momcozy/Medela/Spectra/Eufy/Lansinoh/TSRETE/Elvie/NCVI/Paruu Breast Pump for 24mm Flange/Shield Breastfeeding Essential Replacement Pump Part**BDICOVE**$9.98**169 rev10mo ago](https://www.amazon.com/dp/B0FN3SJJDG) [![Maymom Pump Parts Compatible with Spectra S2 S1 18mm Flange Valve Tube Bottle Backflow Protector Not Original Spectra S2 Replacement Pump Parts Duckbill Valve Bottle](https://m.media-amazon.com/images/I/4123G9vq-bL.jpg)**Maymom Pump Parts Compatible with Spectra S2 S1 18mm Flange Valve Tube Bottle Backflow Protector Not Original Spectra S2 Replacement Pump Parts Duckbill Valve Bottle**Maymom**$32.51**9,124 rev1y ago](https://www.amazon.com/dp/B0F98Z91TK) [![6Pcs Breast Pump Flange Insert 18mm 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/31c+Fdh1sgL.jpg)**6Pcs Breast Pump Flange Insert 18mm 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**$8.77**253 rev1y ago](https://www.amazon.com/dp/B0F1SSQY8P) [![4Pcs Breast Pump Flange Insert 18mm 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/41CLsuY9GCL.jpg)**4Pcs Breast Pump Flange Insert 18mm 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**$7.92**635 rev1y ago](https://www.amazon.com/dp/B0DS6Y163F) [![IVARONAL Flange Insert 2PCS 18mm Compatible with Momcozy M9/M6/M5/S12 Pro/V1 Pro/V2 pro Spectra/Medela/Elvie/NCVI/TSRETE/eufy/Lansinoh/Paruu/MomMed Breast Pump 24mm Shields/Flanges (2pcs-18mm)](https://m.media-amazon.com/images/I/31-bzdgpWDL.jpg)**IVARONAL Flange Insert 2PCS 18mm Compatible with Momcozy M9/M6/M5/S12 Pro/V1 Pro/V2 pro Spectra/Medela/Elvie/NCVI/TSRETE/eufy/Lansinoh/Paruu/MomMed Breast Pump 24mm Shields/Flanges (2pcs-18mm)**IVARONAL**$6.90**848 rev1y ago](https://www.amazon.com/dp/B0DN15L8D7)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![18mm Maymom MyFit Shields Pano Series; Compatible with Medela Breast Pump- PersonalFit Freestyle Harmony Maxi Freestyle Flex Connector; Connect to Maymom Widemouth/Narrow Connector 2pcs](https://m.media-amazon.com/images/I/31dV5jw226L.jpg)**18mm Maymom MyFit Shields Pano Series; Compatible with Medela Breast Pump- PersonalFit Freestyle Harmony Maxi Freestyle Flex Connector; Connect to Maymom Widemouth/Narrow Connector 2pcs**Maymom**$15.53**4.5★**▲ 62%**](https://www.amazon.com/dp/B0D7VFJK7M) [![6Pcs Breast Pump Flange Insert 18mm 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/31c+Fdh1sgL.jpg)**6Pcs Breast Pump Flange Insert 18mm 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**$8.77**4.5★**▲ 34%**](https://www.amazon.com/dp/B0F1SSQY8P) [![MOOMentaneous 18mm 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/41L15XKg8rL.jpg)**MOOMentaneous 18mm Flange and Duckbill Valve Compatible with Spectra S1/S2 and 9 Plus Not Original Spectra Pump Parts Replacement**MOOMentaneous**$12.30**4.6★**▲ 31%**](https://www.amazon.com/dp/B0DJ2KF71C) [![4Pcs Breast Pump Flange Insert 18mm 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/41CLsuY9GCL.jpg)**4Pcs Breast Pump Flange Insert 18mm 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**$7.92**4.5★**▲ 24%**](https://www.amazon.com/dp/B0DS6Y163F) [![Momstouch 18mm 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/41i9lT7BpML.jpg)**Momstouch 18mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts Not Original Replace Accessories.**Momstouch**$16.77**4.3★**▲ 22%**](https://www.amazon.com/dp/B0CKQJ5YF3)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 103 weeks — -6.5% search growth over the last 90 days.

2K2KSpike '25Spike '26 seasonDecMarJunAugNovMarMay

No pronounced peak months · busiest ÷ quietest = 1.3×

## **Reviews**

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

### **What buyers love **

**Size-Overall**39%

*“Fit well”*

**Comfort-Overall**10%

*“Light weight and comfortable”*

**Quality-Overall**9%

*“Highest quality flanges I own”*

**Ease Of Cleaning**8%

*“It is easy to clean and good quality, with stands the heat of steaming”*

**Ease Of Use**8%

*“Easy to use”*

**Value For Money**7%

*“a good price”*

**Durability**5%

*“And have been very durable”*

**Washability**3%

*“wash as well”*

**Design-Overall**2%

*“What I did appreciate about the design that they have a tiny tab to help easily remove the flange”*

**Compatibility-Overall**2%

*“Works great with spectra s1”*

### **What buyers complain about **

**Size-Overall**21%

*“Order wrong size”*

**Ease Of Use**13%

*“will come off so easily”*

**Leak-Proof**11%

*“for some reason this style leaks so bad from not suctioning onto my whole breast no matter how I try to adjust them”*

**Durability**11%

*“they already broke”*

**Quality-Overall**7%

*“just feel cheap”*

**Design-Overall**4%

*“has design flaws”*

**Moist/Dry**4%

*“my pumping bra is still soaked”*

**Strength**4%

*“Already broke”*

**Thickness**4%

*“They are so thin”*

**Washability**4%

*“washed it so I cant send it back”*

### **Top return reasons **

**Size-Overall**81%

**Width**4%

**Functionality-Overall**3%

**Advertised Vs Actual Product**3%

**Defective Material/Parts**2%

**Material Quality**1%

**Breastfeeding Friendly**1%

**Compatibility-Overall**1%

**Value For Money**1%

**Product Condition**1%