19mm flange inserts
Skip itPrices mostly outside the sweet spot ($7.90–$14.73) — this niche doesn't clear our bar today.
Conversion
Incredible17.6%search→purchase rate — share of searches ending in a sale
Review moat
Okay1,826.9avg incumbent reviews — the moat a new listing must climb
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Returns
Okay4.7%return rate — above 6% kills the launch gate
Avg price
Okay$10.36avg listing price — sweet spot $15–$100
Market size
Okay$120K$120K/yr · 66K searches
Growth
Bad-0.0%90-day search growth — must beat 0% to launch
Brand share
Bad93%top-5 brand share — brand-locked demand
Competition
Bad81%top-5 click share — a locked-up shelf
Price range
Bad$7.90–$14.73cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
The top 5 products capture 81% of clicks — a locked-up shelf that new listings rarely crack.Brands
7 falling
Sellers
10
Top-5 brand share
93%
Open market
3%
- Suniceme48%
- BDICOVE13%
- Hranio13%
- GOCROWEEN11%
- Maymom8%
- Momcozy4%
- Open — no brand owns it (1 brand, 3%)
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 10 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Flange Inserts 19mm Compatible with Medela/Spectra/TSRETE/Elvie/Momcozy/Bellababy Breast Pump 24mm Shields/Flanges Reduce 24mm Nipple Tunnel Down to 19 mm 4PCS
Suniceme$8.004.5★971 rev
Flange Insert 19mm 6pcs Flange Sizing Kit Compatible with Spectra Flange Spectra Pump Parts Momcozy Wearable Breast Pump Manual Breast Pump Spectra Breast Pump Medela Pump Parts and More
Hranio$9.904.5★371 rev
4Pcs Breast Pump Flange Insert 19mm 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 19mm 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$7.984.6★347 rev
Flange Inserts 19mm for Medela Spectra 24mm Shields/Flanges Compatible with Momcozy S12 Pro/S9 Pro/S9/S12 Wearable Breast Pump Reduce 24mm Nipple Tunnel Down to 19mm 10PCS
GOCROWEEN$9.944.4★2,046 rev
Newest
by launch date
Momcozy Flange Insert 19mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS 19mm
Momcozy$12.021,166 rev
6Pcs Breast Pump Flange Insert 19mm 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$8.78253 rev
4Pcs Breast Pump Flange Insert 19mm 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$7.90635 rev
Flange Inserts 19mm for Medela Spectra 24mm Shields/Flanges Compatible with Momcozy S12 Pro/S9 Pro/S9/S12 Wearable Breast Pump Reduce 24mm Nipple Tunnel Down to 19mm 10PCS
GOCROWEEN$9.942,046 rev
Flange Inserts 19mm Compatible with Medela/Spectra/TSRETE/Elvie/Momcozy/Bellababy Breast Pump 24mm Shields/Flanges Reduce 24mm Nipple Tunnel Down to 19 mm 4PCS
Suniceme$8.00971 rev
Trending
90-day click momentum6Pcs Breast Pump Flange Insert 19mm 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$8.784.5★
Flange Inserts 19mm for Medela Spectra 24mm Shields/Flanges Compatible with Momcozy S12 Pro/S9 Pro/S9/S12 Wearable Breast Pump Reduce 24mm Nipple Tunnel Down to 19mm 10PCS
GOCROWEEN$9.944.4★
Momcozy Flange Insert 19mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS 19mm
Momcozy$12.024.3★
4Pcs Breast Pump Flange Insert 19mm 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★
Flange Inserts 19mm 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$7.984.6★
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -0.0% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.5×
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“The sizing was accurate”
“High quality loved the storage case”
“Great price”
“are very comfy”
“The little cleaning sponge is wonderful”
“was easy to use”
“It performs exactly as intended”
“Very helpful and useful for breastfeeding”
“Very durable”
“Compatible with spectra pumps”
What buyers complain about
“These are huge”
“Would expect higher quality control from a company who is knowingly serving pregnant and postpartum women”
“Doesnt work for me”
“one of the flange inserts tore right apart immediately after opening”
“Waste of money”
“Too sticky; nipple can move”
“Semi-useful”
“Horrible product, pieces missing, and some pieces broken”
“Not compatible with Spectra”
“Instructions were not clear instead they were confusing”