13mm flange insert
Skip itA small market ($61K/yr) — this niche doesn't clear our bar today.
Conversion
Incredible12.8%search→purchase rate — share of searches ending in a sale
Price range
Good$6.83–$32.58cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Good$13.17avg listing price — sweet spot $15–$100
Competition
Good49%top-5 click share — leaders hold, buyers still browse
Returns
Okay4.0%return rate — above 6% kills the launch gate
Brand share
Okay81%top-5 brand share — brands hold most of the demand
Review moat
Okay2,592.04avg incumbent reviews — the moat a new listing must climb
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Growth
Okay+0.2%90-day search growth — must beat 0% to launch
Market size
Bad$61K$61K/yr · 36K searches
Competition
The top 5 products take 49% of clicks — established leaders, but buyers still shop beyond them.Brands
14 rising
Sellers
21
Top-5 brand share
81%
Open market
12%
- Maymom35%
- BDICOVE24%
- IVARONAL7%
- Momstouch7%
- GOCROWEEN7%
- CubCare7%
- Open — no brand owns it (8 brands, 12%)
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 26 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
6Pcs Breast Pump Flange Insert 13mm 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$8.874.5★253 rev
Maymom 13mm 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$19.634.6★6,022 rev
Maymom Flange Inserts 13 mm for Medela Spectra 24 mm Shields/Flanges Momcozy/Willow Wearable Cup. Compatible with Medela Freestyle Harmony to Reduce 24mm Nipple Tunnel Down to 13 mm; 2pc/Each
Maymom$14.694.4★4,784 rev
4Pcs Breast Pump Flange Insert 13mm 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$7.904.5★635 rev
Flange Inserts 13mm 8PC Compatible with Momcozy S12 pro/S9 pro/S9/S10/S12/Medela/TSRETE/Spectra/Bellababy etc 24mm Wearable Breast Pump Reduce 24mm Tunnel Down to Correct Size
GOCROWEEN$7.994.6★347 rev
Newest
by launch date
13mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Include 2-Pack 13MM Flanges and 4-Pack Duckbill Valves Not Original Replace Accessories
KAIYIV$10.4521 rev
6pcs Updated Silicone Flange Insert 13mm Compatible with Momcozy/Medela/Spectra/Eufy/Lansinoh/TSRETE/Elvie/NCVI/Paruu Breast Pump for 24mm Flange/Shield Breastfeeding Essential Replacement Pump Part
BDICOVE$9.83169 rev
Flange Inserts for Spectra Spectra Replacement Pump Parts for S1/S2/9 Plus Not Original Accessories Breast Pump Parts Include 2-Pack 13MM Flanges and 4-Pack Duckbill Valves
CubCare$9.94119 rev
Maymom Pump Parts Compatible with Spectra S2 S1 13mm Flange Valve Tube Bottle Backflow Protector Not Original Spectra S2 Replacement Pump Parts Duckbill Valve Bottle
Maymom$32.589,124 rev
4PCS Flange Insert 13mm Compatible with Momcozy M5/M6/M9/S12 Pro/S9 Pro/V1 Pro/V2 Pro Spectra/Medela/Elvie/NCVI/TSRETE/eufy/Lansinoh/Paruu/MomMed Breast Pump 24mm Shields/Flanges
Opgroeie$6.99142 rev
Trending
90-day click momentum
Nenesupply 13mm Oval Flanges Compatible with Medela Breast Pump Parts Replace Medela Flange Accessories. Work with Pump in Style Parts Symphony Parts Swing Maxi Harmony and Personalfit Flex
NENESUPPLY$14.614.4★
6pcs Updated Silicone Flange Insert 13mm Compatible with Momcozy/Medela/Spectra/Eufy/Lansinoh/TSRETE/Elvie/NCVI/Paruu Breast Pump for 24mm Flange/Shield Breastfeeding Essential Replacement Pump Part
BDICOVE$9.834.2★
4Pcs Breast Pump Flange Insert 13mm 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$7.904.5★
Momstouch 13mm Flange Compatible with Spectra S1 S2 9 Plus Synergy Gold Breastpump Replacement to Spectra Pump Parts and Spectra Flange; Not Original; Replaces Spectra Shield
Momstouch$15.534.6★
Flange Inserts for Spectra Spectra Replacement Pump Parts for S1/S2/9 Plus Not Original Accessories Breast Pump Parts Include 2-Pack 13MM Flanges and 4-Pack Duckbill Valves
CubCare$9.944.4★
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“Good variety of sizes”
“One thing that really stood out to me was how well-made”
“Good product for price”
“Comfortable”
“The little cleaning sponge is wonderful”
“Easy to use”
“Does the job as advertised”
“Very helpful and useful for breastfeeding”
“The quality feels durable”
“Compatible with Frida Mom manual pump”
What buyers complain about
“the 13 mm I ordered were WAY too small”
“Not compatible with Spectra”
“Would expect higher quality control from a company who is knowingly serving pregnant and postpartum women”
“one of the flange inserts tore right apart immediately after opening”
“Waste of money”
“Does not fully seal which causes my milk to spill back on me”
“Very uncomfortable”
“Thinner silicon at the breast”
“Why did these come dirty”
“Doesnt work for me”