Is leak down tester profitable to sell on Amazon United States?

The niche generates $418K/yr across 21 tracked products. 2 of 4 products launched in the last 360 days are still selling. 90-day search growth is +5.1%. Flapen's verdict: Worth a look (55/100).

How competitive is the leak down tester niche?

13 brands and 49 sellers compete. The top 5 products take 51% of clicks and top 5 brands hold 73% of demand.

What do buyers complain about in leak down tester?

Top complaints mined from reviews: Quality-Overall, Leak-Proof, Functionality-Overall. The return rate is 5.2% — above our launch gate.

When does demand for leak down tester peak?

Demand is steady year-round — the busiest month runs 1.3× the quietest.

What does it cost to enter the leak down tester niche?

Listings span $17.84–$135.60; the average listing price is $43.75 (sweet spot $15–$100). The average incumbent carries 592 reviews — the moat a new listing must climb.

leak down tester

Worth a look

Shows a sweet-spot price point ($43.75 avg), but high returns (5.2%) keeps it on the watch list.

Avg price

Incredible$43.75

avg listing price — sweet spot $15–$100

Quality gap

Great4.3★

avg incumbent rating — lower means beatable quality

Review moat

Good592.29

avg incumbent reviews — the moat a new listing must climb

Price range

Good$17.84–$135.60

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

Conversion

Good5.2%

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

Market size

Good$418K

$418K/yr · 184K searches

Competition

Good51%

top-5 click share — leaders hold, buyers still browse

Brand share

Good73%

top-5 brand share — brands hold most of the demand

Growth

Okay+5.1%

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

Returns

Bad5.2%

return rate — above 5% kills the launch gate

Signals No Dominant Brand High Returns

According to Flapen's Amazon United States niche tracking, leak down tester is a $418K/yr Amazon United States market (184K searches/yr). The top 5 brands hold 73% of demand. Verdict: Worth a look — 55/100.

Data updated Jul 11, 2026 · scored weekly · How we score niches

leak down tester market data

Units sold / yr: 10K–13K; avg 500–750/product
Revenue / yr: $438K–$547K; units × avg price
Conversion rate: 5.2%
Avg BSR: #523
Page quality: 0%
Prime: 100%
Sponsored: 95%
Out of stock: 6.9%
Avg brand age: 58 months
Avg seller age: 197 days

Competition & brand share

The top 5 products take 51% of clicks — established leaders, but buyers still shop beyond them.

Brands

13 rising

Sellers

Top-5 brand share

73%

Top 20: 100%

Top-5 click share

51%

Top 20: 99%

Open market

21%

Yonligonju19%
OTC18%
Prokomon14%
Orion Motor Tech12%
LEIMO KPARTS9%
Marvelity7%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +5.1% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.3×

Open Trend

Top leak down tester search terms

leak down tester75K/yr +4.7%5.9% conv.
cylinder leak down tester37K/yr -0.3%5.9% conv.
leak down test kit16K/yr +5.0%6.0% conv.
leakdown tester kit13K/yr +52.1%7.1% conv.
cylinder leak down tester kit9K/yr +12.6%6.2% conv.
leakdown tester8K/yr -23.5%5.9% conv.
leak down tester automotive6K/yr +6.8%5.0% conv.
engine leak down tester5K/yr -0.6%6.2% conv.
compression leak down tester4K/yr +22.8%6.0% conv.
otc leak down tester5K/yr +6.8%6.3% conv.

All search terms

Top leak down tester 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 21 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

OTC 5609 Cylinder Leakage Tester Kit - Quickly Diagnose Internal Engine Problems like Bad Rings Valves and Leaking Head Gaskets

OTC$104.964.7★2,917 rev

Cylinder Leak Down Tester Compression Test kit - Engine Cylinder Dual Gauge Leakdown Tester kit Diagnostics Tool.

LEIMO KPARTS$33.274.0★1,265 rev

Orion Motor Tech Cylinder Leak Down Tester Kit Dual-Gauge Automotive Engine Leakage Tester for Petrol Engines Adjustable Leakdown Diagnostic Detector Tool Kit with Spark Plug Tester Adapters

Orion Motor Tech$34.394.2★19 rev

TU-21Cylinder Leak Down Tester Kit Automotive Engine Compression Leakage Test Kit for Cars Trucks Motorcycles (Black)

Yonligonju$25.564.3★1,233 rev

Prokomon Engine Cylinder Leak Down Tester Kit;Gasoline Engine Leakdown Tester Kit with Extension Rod;Cylinder Leakage Tester Set for Pressure Check and Leakage Rate Test

Prokomon$35.604.3★252 rev

Newest

by launch date

Orion Motor Tech Cylinder Leak Down Tester Kit Dual-Gauge Automotive Engine Leakage Tester for Petrol Engines Adjustable Leakdown Diagnostic Detector Tool Kit with Spark Plug Tester Adapters

Orion Motor Tech$34.3919 rev

5mo ago

Orion Motor Tech 51pc Compression and Leakage Tester Kit for Petrol & Diesel Engines Cylinder Leak Down Test Kit with Dual Pressure Gauge Adapters Hoses & Quick Couplers for HDi TDCi & PD Engines

Orion Motor Tech$135.601,866 rev

7mo ago

Prokomon Engine Cylinder Leak Down Tester Kit;Gasoline Engine Leakdown Tester Kit with Extension Rod;Cylinder Leakage Tester Set for Pressure Check and Leakage Rate Test (Grey 4pcs)

Prokomon$26.89252 rev

7mo ago

Marvelity Cylinder Leak Down Tester Kit

Marvelity$30.87112 rev

10mo ago

Prokomon Engine Cylinder Leak Down Tester Kit;Cylinder Leakage Tester Set for Pressure Check and Leakage Rate TestGasoline Engine Leakdown Tester Kit with Extension Rod Grey

Prokomon$34.27252 rev

1y ago

What buyers say about leak down tester

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

What buyers love

Quality-Overall21%

“Top notch quality on a budget”

Value For Money17%

“Good value for the price”

Advertised Vs Actual Product11%

“Works as advertised”

Leak-Proof10%

“Affordable leakdown kit for DIY use”

Ease Of Use6%

“Easy to use”

Measurement/Reading Accuracy5%

“Accurate, Durable, and Easy to Use”

Efficiency4%

“it responded well”

Pressure4%

“This cylinder pressure test kit looks great”

Compression3%

“Excellent Kit for Compression”

Functionality-Overall3%

“functional to use good value for the money”

What buyers complain about

Quality-Overall17%

“The overall quality feels cheap”

Leak-Proof15%

“has a 100% leak rate”

Functionality-Overall11%

“Will return guage failed to work”

Measurement/Reading Accuracy10%

“which makes getting an accurate reading nearly impossible”

Pressure6%

“There is no pressure differential between the gauges”

Instructions/User Manual/Troubleshooting5%

“Instructions were poorly written”

Compatibility-Overall4%

“Will not work for 2v or 3v triton motors”

Size-Overall3%

“Poor fitting on flexible hose”

Defective Material/Parts2%

“defective unit”

Advertised Vs Actual Product2%

“False advertisement”

Top return reasons

Leak-Proof20%

Pressure13%

Measurement/Reading Accuracy13%

Functionality-Overall13%

Size-Overall8%

Defective Material/Parts7%

Compatibility-Overall6%

Advertised Vs Actual Product3%

Compression2%

Value For Money2%

Common questions

Is leak down tester profitable to sell on Amazon United States?: The niche generates $418K/yr across 21 tracked products. 2 of 4 products launched in the last 360 days are still selling. 90-day search growth is +5.1%. Flapen's verdict: Worth a look (55/100).
How competitive is the leak down tester niche?: 13 brands and 49 sellers compete. The top 5 products take 51% of clicks and top 5 brands hold 73% of demand.
What do buyers complain about in leak down tester?: Top complaints mined from reviews: Quality-Overall, Leak-Proof, Functionality-Overall. The return rate is 5.2% — above our launch gate.
When does demand for leak down tester peak?: Demand is steady year-round — the busiest month runs 1.3× the quietest.
What does it cost to enter the leak down tester niche?: Listings span $17.84–$135.60; the average listing price is $43.75 (sweet spot $15–$100). The average incumbent carries 592 reviews — the moat a new listing must climb.