16mm flange inserts
Skip itSoft demand (-2.5% this quarter) — this niche doesn't clear our bar today.
Conversion
Incredible16.2%search→purchase rate — share of searches ending in a sale
Price range
Good$6.90–$32.43cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Good$13.28avg listing price — sweet spot $15–$100
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Review moat
Okay2,404.33avg incumbent reviews — the moat a new listing must climb
Market size
Okay$171K$171K/yr · 80K searches
Returns
Okay4.9%return rate — above 6% kills the launch gate
Competition
Okay65%top-5 click share — leaders hold, buyers still browse
Brand share
Okay88%top-5 brand share — brands hold most of the demand
Growth
Bad-2.5%90-day search growth — must beat 0% to launch
Competition
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%
Open market
9%
- Maymom32%
- BDICOVE23%
- TOVVILD14%
- Momstouch13%
- IVARONAL5%
- Nuliie3%
- Open — no brand owns it (6 brands, 9%)
Product shelf
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
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$7.914.5★635 rev
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$19.594.6★6,022 rev
TOVVILD 16mm Flange Inserts for 24mm Flange/Shield Compatible with Momcozy/Medela/MOMMED/Spectra Breast Pumps Pump Parts Replace (4PCS 16mm)
TOVVILD$8.894.4★1,539 rev
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$17.614.7★7,932 rev
Momstouch 16mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts Not Original Replace Accessories.
Momstouch$16.744.3★592 rev
Newest
by launch date
Spectra - Wide Breast Shield Set for Breast Milk Pump - XS 16mm
SPECTRA$29.441,312 rev
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$9.90445 rev
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$6.9063 rev
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$9.91169 rev
MOOMentaneous 16mm Oval Flanges Breast Pump Parts Compatible with Medela Breast Pumps PersonalFit Maxflow Freestyle Flex Swing Maxi Connector
MOOMentaneous$12.61207 rev
Trending
90-day click momentumNuliie 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$9.904.5★
Spectra - Wide Breast Shield Set for Breast Milk Pump - XS 16mm
SPECTRA$29.444.6★
MOOMentaneous 16mm Oval Flanges Breast Pump Parts Compatible with Medela Breast Pumps PersonalFit Maxflow Freestyle Flex Swing Maxi Connector
MOOMentaneous$12.614.2★
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$15.534.5★
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$6.904.4★
Demand & seasonality
Weekly Amazon search volume, last 103 weeks — -2.5% search growth over the last 90 days.Peak months: Jun · busiest ÷ quietest = 1.7×
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“fits comfortably for me”
“Overall, the parts themselves seem great and the quality feels solid”
“Great price”
“Exactly What I Needed”
“The little cleaning sponge is wonderful”
“are very comfy”
“Everything fits well with my Spectra pump”
“was easy to use”
“durable”
“Very helpful and useful for breastfeeding”
What buyers complain about
“These are huge”
“that broke within a few uses”
“Poor quality”
“These were not cheap to buy”
“The flange part is a bit thin”
“These don't work with the Elvie”
“Doesnt work for me”
“fewer manuals would be a less frustrating customer experience”
“Semi-useful”
“Too sticky; nipple can move”