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Skip itBrand-locked demand (top 5 brands take 97% of clicks) — this niche doesn't clear our bar today.
Review moat
Great355.25avg incumbent reviews — the moat a new listing must climb
Returns
Good2.8%return rate — above 6% kills the launch gate
Price range
Okay$5.98–$22.38cheapest to priciest tracked listing — scored on the share inside $15–$100
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Avg price
Okay$10.47avg listing price — sweet spot $15–$100
Conversion
Okay2.8%search→purchase rate — share of searches ending in a sale
Market size
Bad$83K$83K/yr · 280K searches
Growth
Bad-7.3%90-day search growth — must beat 0% to launch
Competition
Bad79%top-5 click share — a locked-up shelf
Brand share
Bad97%top-5 brand share — brand-locked demand
Competition
The top 5 products capture 79% of clicks — a locked-up shelf that new listings rarely crack.Brands
7 rising
Sellers
35
Top-5 brand share
97%
Open market
1%
- Dorman84%
- Figpade6%
- OHYVGD3%
- DC,CLISENCE3%
- Royal Sun1%
- Lisle1%
- Open — no brand owns it (1 brand, 1%)
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 12 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Dorman 42109 Extended Spark Plug Non-Fouler - Universal Fit 2 Pack
Dorman$13.474.6★960 rev
Dorman 42002 Spark Plug Non-Foulers - 18 mm Tapered Seat Compatible with Select Models 2 Pack
Dorman$10.764.3★545 rev
Dorman 42009 Spark Plug Non-Foulers - 18 mm Gasket Seat 2 Pack Universal Fit
Dorman$11.504.4★1,049 rev
Dorman 42004 Spark Plug Non-Foulers - 14 mm Gasket Seat Long Reach Compatible with Select Models 2 Pack
Dorman$9.954.5★105 rev
Dorman 42006 Spark Plug Non-Foulers - 14 mm Tapered Seat Compatible with Select Models 2 Pack
Dorman$7.154.3★156 rev
Newest
by launch date
OHYVGD 2 PCS Sensor Adapter
OHYVGD$22.382 rev
DC CLISENCE 2 Pcs O2 Sensor Bung M18x1.5 Weld Oxygen Spacer Stainless Steel Sensor Adapter (Silver 0.98x0.51x0.86 inch)
DC,CLISENCE$8.023 rev
2PCS M18x1.5 Sensor Bung 304 Stainless Steel Sensor Bung & Plug Kit with 2 Copper Spacer & Inner Hex Head Step Thread Car Accessories for Motorcycle Car Truck Exhaust Systems
Figpade$7.2817 rev
Lemxily Offset O2 Sensor Socket 7/8-Inch (22mm) with 3/8-Inch Drive Universal Fit for Vehicle Oxygen Sensor Removal
Lemxily$5.98958 rev
Stainless Adapters Reduce 02 O2 Sensor Ports Bungs 18MM to 12MM Plug for Dyna Fat Bob Softail Sportster 883 1200 Touring Electra Glide Ultra Road King Street Glide rike Tri-Glide
Royal Sun$9.1720 rev
Trending
90-day click momentumOHYVGD 2 PCS Sensor Adapter
OHYVGD$22.384.5★
2PCS M18x1.5 Sensor Bung 304 Stainless Steel Sensor Bung & Plug Kit with 2 Copper Spacer & Inner Hex Head Step Thread Car Accessories for Motorcycle Car Truck Exhaust Systems
Figpade$7.284.6★
DC CLISENCE 2 Pcs O2 Sensor Bung M18x1.5 Weld Oxygen Spacer Stainless Steel Sensor Adapter (Silver 0.98x0.51x0.86 inch)
DC,CLISENCE$8.025.0★
Dorman 42009 Spark Plug Non-Foulers - 18 mm Gasket Seat 2 Pack Universal Fit
Dorman$11.504.4★
Stainless Adapters Reduce 02 O2 Sensor Ports Bungs 18MM to 12MM Plug for Dyna Fat Bob Softail Sportster 883 1200 Touring Electra Glide Ultra Road King Street Glide rike Tri-Glide
Royal Sun$9.174.5★
Demand
Weekly Amazon search volume, last 49 weeks — -7.3% search growth over the last 90 days.Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“As advertised”
“Fits perfectly”
“Does the job”
“Excellent deal”
“Quality is durable steel”
“Easy to use”
“Spark Plug non fouler”
“Easy to install-”
“they are sturdy”
“Was exactly what was needed to easily remove a rusted O2 sensor on a 2015 Chevy Trax”
What buyers complain about
“they end up falling out of the socket of the O2 sensor”
“Does not fit”
“Poor quality control”
“Doesn't fit 7/8 22mm o2 sensor”
“Due to the split design, the socket tends to flex and lose grip”
“Item was used, not new”
“didn't use them for intended purpose - used them as extensions for compression testing on my vw bug -”
“Doesn't work”
“not good with this installed”
“Older lawn tractor didnt run good”