spectra flange
Skip itBrand-locked demand (top 5 brands take 94% of clicks) — this niche doesn't clear our bar today.
Conversion
Great7.9%search→purchase rate — share of searches ending in a sale
Avg price
Great$15.85avg listing price — sweet spot $15–$100
Price range
Good$8.85–$29.70cheapest to priciest tracked listing — scored on the share inside $15–$100
Market size
Good$528K$528K/yr · 423K searches
Returns
Okay4.3%return rate — above 6% kills the launch gate
Competition
Okay62%top-5 click share — leaders hold, buyers still browse
Quality gap
Okay4.6★avg incumbent rating — lower means beatable quality
Review moat
Okay3,251.1avg incumbent reviews — the moat a new listing must climb
Growth
Bad-3.5%90-day search growth — must beat 0% to launch
Brand share
Bad94%top-5 brand share — brand-locked demand
Competition
The top 5 products take 62% of clicks — established leaders, but buyers still shop beyond them.Brands
8 rising
Sellers
21
Top-5 brand share
94%
Open market
3%
- Maymom46%
- Nursi Luna18%
- SPECTRA13%
- Momstouch9%
- Nuliie8%
- CubCare4%
- Open — no brand owns it (2 brands, 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 21 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps Flange Sizing Kit Silicone Flanges Insert Breastfeeding Essentials Kit for New Moms
Nursi Luna$10.054.6★2,006 rev
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
Spectra Baby USA - Single Breast Flange - Small / 20mm
SPECTRA$14.394.8★3,902 rev
Maymom Wide Neck Pump Part Compatible with Spectra S1/S2 Pumps; Incl Wide Mouth Flange; Not Original Spectra Flange; Replaces Shield (19 mm Two Flanges)
Maymom$16.634.7★7,932 rev
Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve
Maymom$18.804.6★6,022 rev
Newest
by launch date
Momstouch Pump Parts Compatible with Spectra S1/S2/9 Plus Not Original Accessories Full Set Replacements Include 18mm Flanges Duckbill Valves Backflow Protectors Tubings and Bottles
Momstouch$29.70405 rev
Flange Inserts for Spectra Spectra Replacement Pump Parts for S1/S2/9 Plus Not Original Accessories Breast Pump Parts Include 2-Pack 19MM Flanges and 4-Pack Duckbill Valves
CubCare$9.74119 rev
Flange Inserts for Spectra Spectra Replacement Pump Parts for S1/S2/9 Plus Not Original Accessories Breast Pump Parts Include 2-Pack 21MM Flanges and 4-Pack Duckbill Valves
CubCare$9.50119 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
MOOMentaneous 18mm Flange and Duckbill Valve Compatible with Spectra S1/S2 and 9 Plus Not Original Spectra Pump Parts Replacement
MOOMentaneous$12.30111 rev
Trending
90-day click momentumFlange Inserts for Spectra Spectra Replacement Pump Parts for S1/S2/9 Plus Not Original Accessories Breast Pump Parts Include 2-Pack 21MM Flanges and 4-Pack Duckbill Valves
CubCare$9.504.4★
Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps Flange Sizing Kit Silicone Flanges Insert Breastfeeding Essentials Kit for New Moms
Nursi Luna$10.054.6★
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★
Momstouch Pump Parts Compatible with Spectra S1/S2/9 Plus Not Original Accessories Full Set Replacements Include 18mm Flanges Duckbill Valves Backflow Protectors Tubings and Bottles
Momstouch$29.704.6★
PumpMom-us 19mm Soft Rim Flanges Compatible with Spectra S2 S1 9 Plus Breastpumps Accessories Replacement Breast Shield and Duckbill Valves for Spectra Pump Parts and 19 Flange
PUMPMOM-US$16.804.4★
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -3.5% 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
“Good variety of sizes”
“Amazing quality flanges”
“So comfortable”
“Easy to use”
“Very helpful and useful for breastfeeding”
“Great price”
“It performs exactly as intended”
“The little cleaning sponge is wonderful”
“Compatible with Frida Mom manual pump”
“durable”
What buyers complain about
“Need more sizes”
“Quality is a little cheaper then I was hoping for”
“Very uncomfortable”
“one of the flange inserts tore right apart immediately after opening”
“imo these are basically $20 trash not $40 worth of savings. actual spectra parts I think are like $60”
“Doesnt work”
“Horrible product, pieces missing, and some pieces broken”
“Incompatible with Elvie Stride”
“will come off so easily”
“Why did these come dirty”