18mm flange spectra
Skip itBrand-locked demand (top 5 brands take 98% of clicks) — this niche doesn't clear our bar today.
Conversion
Incredible17.7%search→purchase rate — share of searches ending in a sale
Price range
Good$6.90–$32.51cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Good$13.96avg listing price — sweet spot $15–$100
Market size
Okay$241K$241K/yr · 98K searches
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Review moat
Okay3,411.31avg incumbent reviews — the moat a new listing must climb
Returns
Okay5.9%return rate — above 6% kills the launch gate
Competition
Bad73%top-5 click share — a locked-up shelf
Growth
Bad-6.5%90-day search growth — must beat 0% to launch
Brand share
Bad98%top-5 brand share — brand-locked demand
Competition
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%
Open market
0%
- Maymom49%
- BDICOVE19%
- Momstouch15%
- TOVVILD9%
- MOOMentaneous6%
- IVARONAL2%
- Open — no brand owns it (0%)
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 13 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
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$19.744.6★6,022 rev
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$7.924.5★635 rev
Momstouch 18mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts Not Original Replace Accessories.
Momstouch$16.774.3★592 rev
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$17.624.7★7,932 rev
18mm Flange Inserts for 24mm Flange/Shield Compatible with Momcozy/Medela/MOMMED/Bellababy/Spectra Breast Pumps Pump Parts Replace (4PCS 18mm)
TOVVILD$8.874.4★1,539 rev
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$9.98169 rev
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$32.519,124 rev
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$8.77253 rev
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$7.92635 rev
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$6.90848 rev
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$15.534.5★
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$8.774.5★
MOOMentaneous 18mm Flange and Duckbill Valve Compatible with Spectra S1/S2 and 9 Plus Not Original Spectra Pump Parts Replacement
MOOMentaneous$12.304.6★
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$7.924.5★
Momstouch 18mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts Not Original Replace Accessories.
Momstouch$16.774.3★
Demand & seasonality
Weekly Amazon search volume, last 103 weeks — -6.5% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.3×
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“Fit well”
“Light weight and comfortable”
“Highest quality flanges I own”
“It is easy to clean and good quality, with stands the heat of steaming”
“Easy to use”
“a good price”
“And have been very durable”
“wash as well”
“What I did appreciate about the design that they have a tiny tab to help easily remove the flange”
“Works great with spectra s1”
What buyers complain about
“Order wrong size”
“will come off so easily”
“for some reason this style leaks so bad from not suctioning onto my whole breast no matter how I try to adjust them”
“they already broke”
“just feel cheap”
“has design flaws”
“my pumping bra is still soaked”
“Already broke”
“They are so thin”
“washed it so I cant send it back”