Is 19mm flange inserts profitable to sell on Amazon United States?

The niche generates $120K/yr across 10 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -0.0%. Flapen's verdict: Skip it (34/100).

How competitive is the 19mm flange inserts niche?

7 brands and 10 sellers compete. The top 5 products take 81% of clicks and top 5 brands hold 93% of demand.

What do buyers complain about in 19mm flange inserts?

Top complaints mined from reviews: Size-Overall, Quality-Overall, Functionality-Overall. The return rate is 4.7%.

When does demand for 19mm flange inserts peak?

Demand is steady year-round — the busiest month runs 1.5× the quietest.

What does it cost to enter the 19mm flange inserts niche?

Listings span $7.90–$14.73; the average listing price is $10.36 (sweet spot $15–$100). The average incumbent carries 1,827 reviews — the moat a new listing must climb.

19mm flange inserts

Skip it

Prices mostly outside the sweet spot ($7.90–$14.73) — this niche doesn't clear our bar today.

Conversion

Incredible17.6%

search→purchase rate — share of searches ending in a sale

Review moat

Okay1,826.9

avg incumbent reviews — the moat a new listing must climb

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Avg price

Okay$10.36

avg listing price — sweet spot $15–$100

Returns

Okay4.7%

return rate — above 5% kills the launch gate

Market size

Okay$120K

$120K/yr · 66K searches

Growth

Bad-0.0%

90-day search growth — must beat 0% to launch

Brand share

Bad93%

top-5 brand share — brand-locked demand

Competition

Bad81%

top-5 click share — a locked-up shelf

Price range

Bad$7.90–$14.73

cheapest to priciest tracked listing — scored on the share inside $15–$100

According to Flapen's Amazon United States niche tracking, 19mm flange inserts is a $120K/yr Amazon United States market (66K searches/yr). The top 5 brands hold 93% of demand. Verdict: Skip it — 34/100.

Data updated Jul 12, 2026 · scored weekly · How we score niches

19mm flange inserts market data

Units sold / yr: 10K–13K; avg 1,000–1,250/product
Revenue / yr: $104K–$130K; units × avg price
Conversion rate: 17.6%
Avg BSR: #52
Page quality: 0%
Prime: 100%
Sponsored: 100%
Out of stock: 10.3%
Avg brand age: 33 months
Avg seller age: 149 days

Competition & brand share

The top 5 products capture 81% of clicks — a locked-up shelf that new listings rarely crack.

Brands

7 falling

Sellers

Top-5 brand share

93%

Top 20: 100%

Top-5 click share

81%

Top 20: 100%

Open market

Suniceme48%
BDICOVE13%
Hranio13%
GOCROWEEN11%
Maymom8%
Momcozy4%
Open — no brand owns it (1 brand, 3%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -0.0% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.5×

Open Trend

Top 19mm flange inserts search terms

19mm flange inserts37K/yr -7.1%14.9% conv.
19 mm flange inserts19K/yr +8.4%14.8% conv.
size 19 flange inserts4K/yr +11.0%15.9% conv.
flange inserts 19mm3K/yr +36.0%12.6% conv.
19mm flange insert3K/yr -17.4%15.3% conv.

All search terms

Top 19mm flange inserts 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 10 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Flange Inserts 19mm Compatible with Medela/Spectra/TSRETE/Elvie/Momcozy/Bellababy Breast Pump 24mm Shields/Flanges Reduce 24mm Nipple Tunnel Down to 19 mm 4PCS

Suniceme$8.004.5★971 rev

Flange Insert 19mm 6pcs Flange Sizing Kit Compatible with Spectra Flange Spectra Pump Parts Momcozy Wearable Breast Pump Manual Breast Pump Spectra Breast Pump Medela Pump Parts and More

Hranio$9.904.5★371 rev

4Pcs Breast Pump Flange Insert 19mm 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$7.904.5★635 rev

Flange Inserts 19mm 8PC Compatible with Momcozy S12 pro/S9 pro/S9/S10/S12/Medela/TSRETE/Spectra/Bellababy etc 24mm Wearable Breast Pump Reduce 24mm Tunnel Down to Correct Size

GOCROWEEN$7.984.6★347 rev

Flange Inserts 19mm for Medela Spectra 24mm Shields/Flanges Compatible with Momcozy S12 Pro/S9 Pro/S9/S12 Wearable Breast Pump Reduce 24mm Nipple Tunnel Down to 19mm 10PCS

GOCROWEEN$9.944.4★2,046 rev

Newest

by launch date

Momcozy Flange Insert 19mm Compatible with 24mm Flange/Shield of Most Pumps Fit for Momcozy S9Pro/S12Pro/S12Pro-Quick Replacement Accessories 4PCS 19mm

Momcozy$12.021,166 rev

5mo ago

6Pcs Breast Pump Flange Insert 19mm 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$8.78253 rev

1y ago

4Pcs Breast Pump Flange Insert 19mm 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$7.90635 rev

1y ago

Flange Inserts 19mm for Medela Spectra 24mm Shields/Flanges Compatible with Momcozy S12 Pro/S9 Pro/S9/S12 Wearable Breast Pump Reduce 24mm Nipple Tunnel Down to 19mm 10PCS

GOCROWEEN$9.942,046 rev

2y ago

Flange Inserts 19mm Compatible with Medela/Spectra/TSRETE/Elvie/Momcozy/Bellababy Breast Pump 24mm Shields/Flanges Reduce 24mm Nipple Tunnel Down to 19 mm 4PCS

Suniceme$8.00971 rev

2y ago

What buyers say about 19mm flange inserts

What buyers praise and complain about, mined from review topics.

What buyers love

Size-Overall31%

“The sizing was accurate”

Quality-Overall18%

“High quality loved the storage case”

Value For Money8%

“Great price”

Comfort-Overall8%

“are very comfy”

Ease Of Cleaning7%

“The little cleaning sponge is wonderful”

Ease Of Use4%

“was easy to use”

Advertised Vs Actual Product4%

“It performs exactly as intended”

Breastfeeding Friendly4%

“Very helpful and useful for breastfeeding”

Durability3%

“Very durable”

Compatibility-Overall2%

“Compatible with spectra pumps”

What buyers complain about

Size-Overall29%

“These are huge”

Quality-Overall9%

“Would expect higher quality control from a company who is knowingly serving pregnant and postpartum women”

Functionality-Overall7%

“Doesnt work for me”

Durability6%

“one of the flange inserts tore right apart immediately after opening”

Value For Money6%

“Waste of money”

Adhesion/Stickiness4%

“Too sticky; nipple can move”

Ease Of Use4%

“Semi-useful”

Defective Material/Parts4%

“Horrible product, pieces missing, and some pieces broken”

Compatibility-Overall4%

“Not compatible with Spectra”

Instructions/User Manual/Troubleshooting4%

“Instructions were not clear instead they were confusing”

Top return reasons

Size-Overall62%

Functionality-Overall7%

Advertised Vs Actual Product5%

Material Quality5%

Defective Material/Parts4%

Value For Money2%

Breastfeeding Friendly2%

Width2%

Comfort-Overall2%