---
title: "18mm Flange Spectra — $241K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/baby-products/18mm-flange-spectra"
last_updated: "2026-08-08T04:14:53.350Z"
locale: en
meta:
description: "Niche score 38/100 · $241K/yr market · 98K searches/yr · $13.96 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 38/100 · $241K/yr market · 98K searches/yr · $13.96 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "18mm Flange Spectra — $241K/yr Amazon US Niche (2026) - Flapen"
---
# **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 22Price 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
**Competition**
**Bad****73%**
top-5 click share — a locked-up shelf
**Growth**
**Bad****-6.5%**
90-day search growth — must beat 0% to launch
**Returns**
**Bad****5.9%**
return rate — above 5% kills the launch gate
**Brand share**
**Bad****98%**
top-5 brand share — brand-locked demand
**Signals**[** High Returns**](https://flapen.com/research/niches?market=us&signal=high_returns "Return rate > 5%")
According to Flapen's Amazon United States niche tracking, 18mm flange spectra is a $241K/yr Amazon United States market (98K searches/yr). The top 5 brands hold 98% of demand. Verdict: Skip it — 38/100.
Data updated Jul 12, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **18mm flange spectra market data**
- **Units sold / yr**
- **15K–20K**
- avg 1,250–1,500/product
- **Revenue / yr**
- **$209K–$279K**
- units × avg price
- **Conversion rate**
- **17.7%**
- **Avg BSR**
- **#33**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **92%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **31 months**
- **Avg seller age**
- **187 days**
## **Competition & brand share**
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%**
Top 20: 100%
**Top-5 click share**
**73%**
Top 20: 100%
**Open market**
**0%**
- Maymom49% - BDICOVE19% - Momstouch15% - TOVVILD9% - MOOMentaneous6% - IVARONAL2% - Open — no brand owns it (0%)
## **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×
[**Open Trend **](https://flapen.com/research/us/baby-products/18mm-flange-spectra/trend)
## **Top 18mm flange spectra search terms**
- **18mm flange insert**18K/yr-5.0%13.6% conv. - **spectra flange 18mm**17K/yr-9.3%17.2% conv. - **18mm flange spectra**16K/yr-17.6%16.5% conv. - **18 mm flange insert**11K/yr+1.9%14.0% conv. - **spectra 18mm flange set**11K/yr+5.5%16.7% conv. - **18 mm flange spectra**11K/yr-11.0%15.5% conv. - **spectra 18mm flange**5K/yr+1.7%19.1% conv. - **18mm flange**5K/yr-6.3%10.2% conv. - **18mm spectra flange**2K/yr+4.7%19.1% conv. - **maymom 18mm flange spectra**2K/yr-29.3%21.6% conv. [**All search terms **](https://flapen.com/research/us/baby-products/18mm-flange-spectra/search-terms)
## **Top 18mm flange spectra 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%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**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**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.**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**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)**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**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**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**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**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)**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**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**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**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**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.**Momstouch**$16.77**4.3★**▲ 22%**](https://www.amazon.com/dp/B0CKQJ5YF3)
**~~View all trending →~~**
## **What buyers say about 18mm flange spectra**
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%
## **Common questions**
- **Is 18mm flange spectra profitable to sell on Amazon United States?**
- The niche generates $241K/yr across 13 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -6.5%. Flapen's verdict: Skip it (38/100).
- **How competitive is the 18mm flange spectra niche?**
- 6 brands and 8 sellers compete. The top 5 products take 73% of clicks and top 5 brands hold 98% of demand.
- **What do buyers complain about in 18mm flange spectra?**
- Top complaints mined from reviews: Size-Overall, Ease Of Use, Leak-Proof. The return rate is 5.9% — above our launch gate.
- **When does demand for 18mm flange spectra peak?**
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- **What does it cost to enter the 18mm flange spectra niche?**
- Listings span $6.90–$32.51; the average listing price is $13.96 (sweet spot $15–$100). The average incumbent carries 3,411 reviews — the moat a new listing must climb.
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