spectra flange 28mm
Skip itA small market ($29K/yr) — this niche doesn't clear our bar today.
Conversion
Incredible14.2%search→purchase rate — share of searches ending in a sale
Avg price
Incredible$24.56avg listing price — sweet spot $15–$100
Price range
Great$9.01–$64.47cheapest to priciest tracked listing — scored on the share inside $15–$100
Review moat
Okay1,684.71avg incumbent reviews — the moat a new listing must climb
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Growth
Bad-3.3%90-day search growth — must beat 0% to launch
Competition
Bad77%top-5 click share — a locked-up shelf
Brand share
Bad93%top-5 brand share — brand-locked demand
Returns
Bad8.8%return rate — above 6% kills the launch gate
Market size
Bad$29K$29K/yr · 8K searches
Competition
The top 5 products capture 77% of clicks — a locked-up shelf that new listings rarely crack.Brands
9 rising
Sellers
15
Top-5 brand share
93%
Open market
5%
- Momstouch34%
- SPECTRA29%
- Maymom24%
- MilkFlow4%
- BALIME2%
- MOOMentaneous2%
- Open — no brand owns it (3 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 14 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Momstouch 28mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts Not Original Replace Accessories.
Momstouch$16.584.3★592 rev
Maymom Pump Parts Compatible with Spectra S2 S1 28mm Flange Tube Bottle Backflow Protector Valve Not Original Spectra S2 Replacement Pump Parts Duckbill Valve Bottle
Maymom$32.144.6★9,124 rev
Spectra - Wide Breast Shield Set for Breast Milk Pumps - Large 28mm
SPECTRA$22.284.6★1,312 rev
Spectra - Premium Breast Milk Pump Accessory Kit with Baby Bottles - Large 28mm - Breast Pump Accessories - 2 Pack
SPECTRA$64.474.7★742 rev
Momstouch 28mm Flange Compatible with Spectra S1 S2 9 Plus Synergy Gold Breastpump Replacement to Spectra Pump Parts and Flange; Not Original; Replaces Shield
Momstouch$15.464.6★301 rev
Newest
by launch date
Pump Parts 4PCS Replacement Kit for Spectra S1/S2/S9 Plus/Synergy Gold Includes 28mm Flanges Duckbill Valves Backflow Protectors Tubes & Bottles (Not Original Accessories)
MilkFlow$38.1169 rev
28mm Flange Pump Parts Compatible with Spectra S1/S2/9Plus Not Original Spectra S2 Replacement Pump Parts Full Set Replacement Kit Include 28mm Flange Duckbill Valve Backflow Protector Tube Bottle
afontoto$20.47611 rev
Pump Replacement Parts Compatible with Spectra S1/S2/9 Plus Not Original Accessories Full Set Include 28mm Flanges Valves Tubings and BottlesBackflow Protectors and Duckbills
MilkFlow$20.43378 rev
4 Full Pump Parts Kits for Spectra S1/S2/9 Plus/Synergy Gold Replacement Kit for Spectra Pump Parts 4PC Include 28mm Flange Duckbill Valve Tube Bottle Backflow Protector Not Original Accessories
IVARONAL$34.96194 rev
BALIME Pump Parts Compatible with Spectra S1/S2/9 Plus 2Pcs Duckbill Valves and 2Pcs 28mm Flange (Not Original Spectra Accessories)
BALIME$10.30129 rev
Trending
90-day click momentum28mm Flange Pump Parts Compatible with Spectra S1/S2/9Plus Not Original Spectra S2 Replacement Pump Parts Full Set Replacement Kit Include 28mm Flange Duckbill Valve Backflow Protector Tube Bottle
afontoto$20.474.4★
Pump Replacement Parts Compatible with Spectra S1/S2/9 Plus Not Original Accessories Full Set Include 28mm Flanges Valves Tubings and BottlesBackflow Protectors and Duckbills
MilkFlow$20.434.4★
Spectra - Premium Breast Milk Pump Accessory Kit with Baby Bottles - Large 28mm - Breast Pump Accessories - 2 Pack
SPECTRA$64.474.7★
KAIYIV 28mm Flanges Compatible with Spectra S1/S2/9 Plus/Synergy Gold Wide Neck Pump Replacement Parts Not Original Spectra Flange (2 PCS)
KAIYIV$9.014.4★
Momstouch 28mm Flange Compatible with Spectra S1 S2 9 Plus Synergy Gold Breastpump Replacement to Spectra Pump Parts and Flange; Not Original; Replaces Shield
Momstouch$15.464.6★
Demand & seasonality
Weekly Amazon search volume, last 101 weeks — -3.3% search growth over the last 90 days.Peak months: Aug · busiest ÷ quietest = 1.6×
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“fit best if you kept this kit together”
“They work perfect with my Spectra S1 breast pump”
“Great quality”
“Great with Spectra blue”
“Great value replacement parts”
“This product is as advertised”
What buyers complain about
“Does not include parts needed to use”
“The duckbills I received arent working at all”
“However the tubing comes disconnected from the back flow protector pretty easily and often”