20mm flange insert
Skip itBrand-locked demand (top 5 brands take 98% of clicks) — this niche doesn't clear our bar today.
Conversion
Incredible14.2%search→purchase rate — share of searches ending in a sale
Avg price
Great$17.28avg listing price — sweet spot $15–$100
Price range
Good$8.78–$32.49cheapest to priciest tracked listing — scored on the share inside $15–$100
Review moat
Okay3,288.56avg incumbent reviews — the moat a new listing must climb
Quality gap
Okay4.6★avg incumbent rating — lower means beatable quality
Market size
Okay$125K$125K/yr · 51K searches
Returns
Bad5.9%return rate — above 5% kills the launch gate
Growth
Bad-14.7%90-day search growth — must beat 0% to launch
Competition
Bad89%top-5 click share — a locked-up shelf
Brand share
Bad98%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, 20mm flange insert is a $125K/yr Amazon United States market (51K searches/yr). The top 5 brands hold 98% of demand. Verdict: Skip it — 33/100.
Data updated Jul 12, 2026 · scored weekly · How we score niches
20mm flange insert market data
- Units sold / yr
- 10K–13K
- avg 1,250–1,500/product
- Revenue / yr
- $173K–$216K
- units × avg price
- Conversion rate
- 14.2%
- Avg BSR
- #82
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 89%
- Out of stock
- 0.0%
- Avg brand age
- 34 months
- Avg seller age
- 160 days
Competition & brand share
The top 5 products capture 89% of clicks — a locked-up shelf that new listings rarely crack.Brands
6 flat
Sellers
12
Top-5 brand share
98%
Top 20: 100%
Top-5 click share
89%
Top 20: 100%
Open market
0%
- Maymom37%
- SPECTRA31%
- Momstouch24%
- MOOMentaneous5%
- TOVVILD2%
- Gotocut2%
Demand & seasonality
Weekly Amazon search volume, last 102 weeks — -14.7% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.2×
Top 20mm flange insert search terms
- spectra flange 20mm14K/yr
- spectra 20mm flange12K/yr
- 20mm flange spectra10K/yr
- 20 mm flange spectra8K/yr
- spectra 20 mm flange set6K/yr
Top 20mm flange insert products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 9 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Spectra Baby USA - Single Breast Flange - Small / 20mm
SPECTRA$14.394.8★3,902 rev
Maymom 20 mm 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$19.534.6★6,022 rev
Momstouch 20mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts Not Original Replace Accessories.
Momstouch$16.644.3★592 rev
Maymom Wide Neck Pump Part for Spectra S1/S2 Pumps; Incl Wide Mouth Flange; Not Original Spectra Flange; Replaces Spectra Shield (20 mm Two Flanges)
Maymom$16.724.7★7,932 rev
MOOMentaneous 20mm Flange and Duckbill Valve Compatible with Spectra S1/S2 and 9 Plus Not Original Spectra Pump Parts Replacement
MOOMentaneous$12.554.6★111 rev
Newest
by launch date
Gotocut 20mm Flange Kit Compatible with Spectra S1/S2/9 Plus/Motif Luna Includes Flange 20mm Bottles Tubing Valves and Backflow Protectors
Gotocut$18.8074 rev
MOOMentaneous 20mm Flange and Duckbill Valve Compatible with Spectra S1/S2 and 9 Plus Not Original Spectra Pump Parts Replacement
MOOMentaneous$12.55111 rev
TOVVILD 20mm Flange Inserts for 24mm Flange/Shield Compatible with Momcozy/Medela/MOMMED/Spectra Breast Pumps Pump Parts Replace (4PCS 20mm)
TOVVILD$8.781,539 rev
Momstouch 20mm Flange Compatible with Spectra S1 S2 9 Plus Synergy Gold Breastpump Replacement to Spectra Pump Parts and Flange; Not Original; Replaces Shield
Momstouch$15.60301 rev
Momstouch 20mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts Not Original Replace Accessories.
Momstouch$16.64592 rev
Trending
90-day click momentumMOOMentaneous 20mm Flange and Duckbill Valve Compatible with Spectra S1/S2 and 9 Plus Not Original Spectra Pump Parts Replacement
MOOMentaneous$12.554.6★
Maymom Pump Parts Compatible with Spectra S2 S1 20mm Flange Valve Tube Bottle Backflow Protector Not Original Spectra S2 Replacement Pump Parts Duckbill Valve Bottle
Maymom$32.494.6★
Gotocut 20mm Flange Kit Compatible with Spectra S1/S2/9 Plus/Motif Luna Includes Flange 20mm Bottles Tubing Valves and Backflow Protectors
Gotocut$18.804.5★
Spectra Baby USA - Single Breast Flange - Small / 20mm
SPECTRA$14.394.8★
Momstouch 20mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump Replacement to Spectra Pump Parts Not Original Replace Accessories.
Momstouch$16.644.3★
What buyers say about 20mm flange insert
What buyers praise and complain about, mined from review topics.What buyers love
“Perfect Fit”
“Works great with my Spectra breast pump”
“I have ordered this twice because I love the price point”
“Good quality”
“Works as intended”
“Does the job though it has low sunction”
“have made pumping so much more comfortable”
“I got these to have multiple sets so I don't have to wash after every use”
What buyers complain about
“Non functional”
“Not compatible with SpectraS1”
“Didn't fit at all”
“resulting in spilled milk both times”
“Poor quality”
“It makes noises like air is escaping”
“When the same piece broke again on the second set”
“Unfortunately I cant use them”
Top return reasons
Common questions
- Is 20mm flange insert profitable to sell on Amazon United States?
- The niche generates $125K/yr across 9 tracked products. 90-day search growth is -14.7%. Flapen's verdict: Skip it (33/100).
- How competitive is the 20mm flange insert niche?
- 6 brands and 12 sellers compete. The top 5 products take 89% of clicks and top 5 brands hold 98% of demand.
- What do buyers complain about in 20mm flange insert?
- Top complaints mined from reviews: Functionality-Overall, Compatibility-Overall, Size-Overall. The return rate is 5.9% — above our launch gate.
- When does demand for 20mm flange insert peak?
- Demand is steady year-round — the busiest month runs 1.2× the quietest.
- What does it cost to enter the 20mm flange insert niche?
- Listings span $8.78–$32.49; the average listing price is $17.28 (sweet spot $15–$100). The average incumbent carries 3,289 reviews — the moat a new listing must climb.