---
title: "16mm Flange Inserts — $171K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/baby-products/16mm-flange-inserts"
last_updated: "2026-08-09T01:32:27.595Z"
locale: en
meta:
description: "Niche score 42/100 · $171K/yr market · 80K searches/yr · $13.28 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 42/100 · $171K/yr market · 80K searches/yr · $13.28 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "16mm Flange Inserts — $171K/yr Amazon US Niche (2026) - Flapen"
---
# **16mm flange inserts**
**Skip it**
Soft demand (-2.5% this quarter) — this niche doesn't clear our bar today.
Market size 35Growth 24Conversion 98Competition 33Returns 26Price range 68Avg price 61Brand share 28Review moat 41Quality gap 48
**Conversion**
**Incredible****16.2%**
search→purchase rate — share of searches ending in a sale
**Price range**
**Good****$6.90–$32.43**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Good****$13.28**
avg listing price — sweet spot $15–$100
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Okay****2,404.33**
avg incumbent reviews — the moat a new listing must climb
**Market size**
**Okay****$171K**
$171K/yr · 80K searches
**Competition**
**Okay****65%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Okay****88%**
top-5 brand share — brands hold most of the demand
**Returns**
**Okay****4.9%**
return rate — above 5% kills the launch gate
**Growth**
**Bad****-2.5%**
90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, 16mm flange inserts is a $171K/yr Amazon United States market (80K searches/yr). The top 5 brands hold 88% of demand. Demand peaks in Jun. Verdict: Skip it — 42/100.
Data updated Jul 12, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **16mm flange inserts market data**
- **Units sold / yr**
- **13K–15K**
- avg 500–750/product
- **Revenue / yr**
- **$166K–$199K**
- units × avg price
- **Conversion rate**
- **16.2%**
- **Avg BSR**
- **#63**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **79%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **33 months**
- **Avg seller age**
- **161 days**
## **Competition & brand share**
The top 5 products take 65% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**12 **▲rising
**Sellers**
**15**
**Top-5 brand share**
**88%**
Top 20: 100%
**Top-5 click share**
**65%**
Top 20: 96%
**Open market**
**9%**
- Maymom32% - BDICOVE23% - TOVVILD14% - Momstouch13% - IVARONAL5% - Nuliie3% - Open — no brand owns it (6 brands, 9%)
## **Demand & seasonality**
Weekly Amazon search volume, last 103 weeks — -2.5% search growth over the last 90 days.
2K1KSpike '25Spike '26 seasonDecMarJunAugNovMarMay
Peak months: Jun · busiest ÷ quietest = 1.7×
[**Open Trend **](https://flapen.com/research/us/baby-products/16mm-flange-inserts/trend)
## **Top 16mm flange inserts search terms**
- **16mm flange inserts**18K/yr-6.7%14.6% conv. - **16 mm flange insert**15K/yr+3.4%15.6% conv. - **16mm flange spectra**11K/yr-12.2%13.7% conv. - **spectra flange 16mm**9K/yr-3.8%16.6% conv. - **spectra 16mm flange**6K/yr+3.8%18.0% conv. - **16 mm flange spectra**6K/yr-4.4%16.5% conv. - **16mm flange**5K/yr-5.3%12.2% conv. - **size 16 flange insert**3K/yr+20.9%16.7% conv. - **16 mm flange**3K/yr+7.8%10.6% conv. - **spectra 16 mm flange set**3K/yr+2.8%16.6% conv. [**All search terms **](https://flapen.com/research/us/baby-products/16mm-flange-inserts/search-terms)
## **Top 16mm flange inserts 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%5%$9K10%$17K15%$26K20%$34K101001K10K 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**4Pcs Breast Pump Flange Insert 16mm 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**$7.91**4.5★635 rev](https://www.amazon.com/dp/B0DS6XM24H) [2**Maymom 16mm 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**$19.59**4.6★6,022 rev](https://www.amazon.com/dp/B0BLCWN9BW) [3**TOVVILD 16mm Flange Inserts for 24mm Flange/Shield Compatible with Momcozy/Medela/MOMMED/Spectra Breast Pumps Pump Parts Replace (4PCS 16mm)**TOVVILD**$8.89**4.4★1,539 rev](https://www.amazon.com/dp/B0CSFLKG3L) [4**Maymom 16mm Wide Neck Pump Part for Spectra S1/S2 Pumps; Compatible with Motif Luna Pump; Incl Wide Mouth Flange; Not Original Spectra Flange**Maymom**$17.61**4.7★7,932 rev](https://www.amazon.com/dp/B0BJZPR2Q4) [5**Momstouch 16mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts Not Original Replace Accessories.**Momstouch**$16.74**4.3★592 rev](https://www.amazon.com/dp/B0CKQDLD4Y)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Spectra - Wide Breast Shield Set for Breast Milk Pump - XS 16mm**SPECTRA**$29.44**1,312 rev4mo ago](https://www.amazon.com/dp/B0GMNWWXSM) [**Nuliie 5-in-1 Flange Sizing Kit 12/14/16/18/20mm for 24mm Flange/Shield of Most Pumps 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort BPA-Free Pump Essential for Moms**Nuliie**$9.90**445 rev5mo ago](https://www.amazon.com/dp/B0GJRV3N1Q) [**2PC Flange Insert 16mm Compatible with Momcozy Air 1/W1/M9/M6/M5/V1 Pro/V2 Pro for Spectra/eufy/Medela/Elvie/Lansinoh/Paruu with 24mm Flange/Shield Pump Pumping Essentials Flange Insert Kits**Wevedk**$6.90**63 rev8mo ago](https://www.amazon.com/dp/B0G1C19J4K) [**6pcs Updated Silicone Flange Insert 16mm Compatible with Momcozy/Medela/Spectra/Eufy/Lansinoh/TSRETE/Elvie/NCVI/Paruu Breast Pump for 24mm Flange/Shield Breastfeeding Essential Replacement Pump Part**BDICOVE**$9.91**169 rev10mo ago](https://www.amazon.com/dp/B0FN3SYBT9) [**MOOMentaneous 16mm Oval Flanges Breast Pump Parts Compatible with Medela Breast Pumps PersonalFit Maxflow Freestyle Flex Swing Maxi Connector**MOOMentaneous**$12.61**207 rev11mo ago](https://www.amazon.com/dp/B0FKTJYCBZ)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Nuliie 5-in-1 Flange Sizing Kit 12/14/16/18/20mm for 24mm Flange/Shield of Most Pumps 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort BPA-Free Pump Essential for Moms**Nuliie**$9.90**4.5★**▲ 251%**](https://www.amazon.com/dp/B0GJRV3N1Q) [**Spectra - Wide Breast Shield Set for Breast Milk Pump - XS 16mm**SPECTRA**$29.44**4.6★**▲ 245%**](https://www.amazon.com/dp/B0GMNWWXSM) [**MOOMentaneous 16mm Oval Flanges Breast Pump Parts Compatible with Medela Breast Pumps PersonalFit Maxflow Freestyle Flex Swing Maxi Connector**MOOMentaneous**$12.61**4.2★**▲ 115%**](https://www.amazon.com/dp/B0FKTJYCBZ) [**16mm 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★**▲ 83%**](https://www.amazon.com/dp/B0D7VKCX1S) [**2PC Flange Insert 16mm Compatible with Momcozy Air 1/W1/M9/M6/M5/V1 Pro/V2 Pro for Spectra/eufy/Medela/Elvie/Lansinoh/Paruu with 24mm Flange/Shield Pump Pumping Essentials Flange Insert Kits**Wevedk**$6.90**4.4★**▲ 69%**](https://www.amazon.com/dp/B0G1C19J4K)
**~~View all trending →~~**
## **What buyers say about 16mm flange inserts**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**31%
*“fits comfortably for me”*
**Quality-Overall**15%
*“Overall, the parts themselves seem great and the quality feels solid”*
**Value For Money**8%
*“Great price”*
**Advertised Vs Actual Product**8%
*“Exactly What I Needed”*
**Ease Of Cleaning**7%
*“The little cleaning sponge is wonderful”*
**Comfort-Overall**6%
*“are very comfy”*
**Compatibility-Overall**4%
*“Everything fits well with my Spectra pump”*
**Ease Of Use**4%
*“was easy to use”*
**Durability**4%
*“durable”*
**Breastfeeding Friendly**4%
*“Very helpful and useful for breastfeeding”*
### **What buyers complain about **
**Size-Overall**25%
*“These are huge”*
**Durability**12%
*“that broke within a few uses”*
**Quality-Overall**8%
*“Poor quality”*
**Value For Money**6%
*“These were not cheap to buy”*
**Thickness**6%
*“The flange part is a bit thin”*
**Compatibility-Overall**4%
*“These don't work with the Elvie”*
**Functionality-Overall**4%
*“Doesnt work for me”*
**Instructions/User Manual/Troubleshooting**4%
*“fewer manuals would be a less frustrating customer experience”*
**Ease Of Use**3%
*“Semi-useful”*
**Adhesion/Stickiness**3%
*“Too sticky; nipple can move”*
### **Top return reasons **
**Size-Overall**70%
**Advertised Vs Actual Product**5%
**Functionality-Overall**5%
**Defective Material/Parts**3%
**Material Quality**3%
**Width**2%
**Value For Money**2%
**Breastfeeding Friendly**2%
**Compatibility-Overall**1%
**Comfort-Overall**1%
## **Common questions**
- **Is 16mm flange inserts profitable to sell on Amazon United States?**
- The niche generates $171K/yr across 24 tracked products. 2 of 5 products launched in the last 360 days are still selling. 90-day search growth is -2.5%. Flapen's verdict: Skip it (42/100).
- **How competitive is the 16mm flange inserts niche?**
- 12 brands and 15 sellers compete. The top 5 products take 65% of clicks and top 5 brands hold 88% of demand.
- **What do buyers complain about in 16mm flange inserts?**
- Top complaints mined from reviews: Size-Overall, Durability, Quality-Overall. The return rate is 4.9%.
- **When does demand for 16mm flange inserts peak?**
- Demand peaks in Jun; the busiest month runs 1.7× the quietest.
- **What does it cost to enter the 16mm flange inserts niche?**
- Listings span $6.90–$32.43; the average listing price is $13.28 (sweet spot $15–$100). The average incumbent carries 2,404 reviews — the moat a new listing must climb.
## **Related niches in Baby Products**
- 65 [**training diapers 2t-3t**](https://flapen.com/research/us/baby-products/training-diapers-2t-3t)$6.1M/yr+8.7%**Launch it**- 65 [**baby car seat fan**](https://flapen.com/research/us/baby-products/baby-car-seat-fan)$31K/yr+151.9%**Worth a look**- 65 [**tummy time toys**](https://flapen.com/research/us/baby-products/tummy-time-toys)$11.8M/yr-9.5%**Worth a look**- 65 [**sunscreen brush**](https://flapen.com/research/us/baby-products/sunscreen-brush)$615K/yr+314.7%**Worth a look**- 65 [**toddler step stool**](https://flapen.com/research/us/baby-products/toddler-step-stool)$4.1M/yr-7.9%**Worth a look**- 65 [**water baby carrier**](https://flapen.com/research/us/baby-products/water-baby-carrier)$431K/yr+176.5%**Worth a look**[**All Baby Products niches **](https://flapen.com/research/us/baby-products)