17mm flange spectra
Skip itA concentrated shelf (top 5 take 83% of clicks) — this niche doesn't clear our bar today.
Conversion
Incredible18.7%search→purchase rate — share of searches ending in a sale
Avg price
Great$16.05avg listing price — sweet spot $15–$100
Price range
Great$9.65–$32.51cheapest to priciest tracked listing — scored on the share inside $15–$100
Market size
Good$334K$334K/yr · 111K searches
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Review moat
Okay2,933.91avg incumbent reviews — the moat a new listing must climb
Returns
Okay4.7%return rate — above 6% kills the launch gate
Brand share
Bad92%top-5 brand share — brand-locked demand
Growth
Bad-15.6%90-day search growth — must beat 0% to launch
Competition
Bad83%top-5 click share — a locked-up shelf
Competition
The top 5 products capture 83% of clicks — a locked-up shelf that new listings rarely crack.Brands
8 rising
Sellers
9
Top-5 brand share
92%
Open market
5%
- Maymom57%
- Momstouch15%
- NENESUPPLY10%
- CubCare7%
- afontoto4%
- PUMPMOM-US3%
- Open — no brand owns it (2 brands, 5%)
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 11 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Maymom 17mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Not Original Spectra S2 Replacement Pump Parts Flange Duckbill Valve
Maymom$19.764.6★6,022 rev
Maymom 2x17 mm Wide Neck Pump Parts Compatible with Spectra S1/S2 Pumps; Incl Wide Mouth Flanges; Not Original Spectra Flange Shield (Two Small Flanges)
Maymom$16.774.8★3,464 rev
Momstouch 17mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Pump Parts Not Original Replace Accessories.
Momstouch$16.784.3★592 rev
Nenesupply 17mm 2 pc Flanges Compatible with Spectra S2 S1 9 Plus Synergy Gold Breastpump Replacement to Spectra Pump Parts Flange Accessories Wide Mouth Work with Valve Backflow Protector Bottle
NENESUPPLY$12.334.7★3,324 rev
Flange Inserts for Spectra Spectra Replacement Pump Parts for S1/S2/9 Plus Not Original Accessories Breast Pump Parts Include 2-Pack17MM Flanges and 4-Pack Duckbill Valves
CubCare$9.974.4★119 rev
Newest
by launch dateFlange Inserts for Spectra Spectra Replacement Pump Parts for S1/S2/9 Plus Not Original Accessories Breast Pump Parts Include 2-Pack17MM Flanges and 4-Pack Duckbill Valves
CubCare$9.97119 rev
Momstouch 17mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Pump Parts Not Original Replace Accessories.
Momstouch$16.78592 rev
17mm Flanges Compatible with Spectra S2 S1 9 Plus Synergy Gold Breastpump Not Original Spectra Replacement Pump Parts Wide Mouth Flange Accessories for Elastic Nipples Work with Backflow Protector
afontoto$9.65112 rev
GOTOCUT 4PCS 17mm Breast Pump Flanges Compatible with Spectra S1/S2/9Plus/Synergy Gold Motif Luna Wide-Mouth Bottle Fit Breast Pump Accessories
Gotocut$15.42107 rev
PumpMom-us 17mm Oval Flanges with Soft Rim Compatible with Spectra S2 S1 9 Plus Breastpumps Accessories Replacement Breast Shield and Duckbill Valves for Spectra Pump Parts and Flange
PUMPMOM-US$16.77915 rev
Trending
90-day click momentum17mm Flanges Compatible with Spectra S2 S1 9 Plus Synergy Gold Breastpump Not Original Spectra Replacement Pump Parts Wide Mouth Flange Accessories for Elastic Nipples Work with Backflow Protector
afontoto$9.654.3★
Nenesupply 17mm 2 pc Flanges Compatible with Spectra S2 S1 9 Plus Synergy Gold Breastpump Replacement to Spectra Pump Parts Flange Accessories Wide Mouth Work with Valve Backflow Protector Bottle
NENESUPPLY$12.334.7★
Momstouch 17mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Pump Parts Not Original Replace Accessories.
Momstouch$16.784.3★
PumpMom-us 17mm Oval Flanges with Soft Rim Compatible with Spectra S2 S1 9 Plus Breastpumps Accessories Replacement Breast Shield and Duckbill Valves for Spectra Pump Parts and Flange
PUMPMOM-US$16.774.4★
Maymom 2x17 mm Wide Neck Pump Parts Compatible with Spectra S1/S2 Pumps; Incl Wide Mouth Flanges; Not Original Spectra Flange Shield (Two Small Flanges)
Maymom$16.774.8★
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -15.6% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.4×
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“Fit perfect”
“Good Quality”
“Worth the buy”
“just as well as the brand name”
“More convenient than inserts”
“Works well with Spectra”
“They are very comfortable”
“easy to clean”
“they are still going strong”
“The material is soft”
What buyers complain about
“Not a great fit on rhe spectra bottles”
“Cracked in 2 weeks”
“None of them make this noise”
“Not worth it”
“Does not work”
“the flanges did not seem like they should have made it past quality control”
“Probably the material is not as good to go through a steam sanitizer”
“I rather that than being too easy to slip in and out”
“irritating my skin”
“There is some leaking around the flange when pouring because they arent a eufy product”