---
title: "Leak Down Tester — $418K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/leak-down-tester"
last_updated: "2026-08-10T16:17:35.521Z"
locale: en
meta:
description: "Niche score 55/100 · $418K/yr market · 184K searches/yr · $43.75 avg price. High returns (5.2%) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 55/100 · $418K/yr market · 184K searches/yr · $43.75 avg price. High returns (5.2%) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Leak Down Tester — $418K/yr Amazon US Niche (2026) - Flapen"
---
# **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.
Market size 56Growth 31Conversion 60Competition 56Returns 24Price range 70Avg price 95Brand share 54Review moat 73Quality gap 78
**Avg price**
**Incredible****$43.75**
avg listing price — sweet spot $15–$100
**Quality gap**
**Great****4.3★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Good****592.29**
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**
**Good****5.2%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Good****$418K**
$418K/yr · 184K searches
**Competition**
**Good****51%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Good****73%**
top-5 brand share — brands hold most of the demand
**Growth**
**Okay****+5.1%**
90-day search growth — must beat 0% to launch
**Returns**
**Bad****5.2%**
return rate — above 5% kills the launch gate
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%") [** High Returns**](https://flapen.com/research/niches?market=us&signal=high_returns "Return rate > 5%")
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 ~~](https://flapen.com/research/methodology)
## **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**
**49**
**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.
4K3KSpike '25Prime Day '25 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/us/automotive/leak-down-tester/trend)
## **Top leak down tester search terms**
- **leak down tester**75K/yr+4.7%5.9% conv. - **cylinder leak down tester**37K/yr-0.3%5.9% conv. - **leak down test kit**16K/yr+5.0%6.0% conv. - **leakdown tester kit**13K/yr+52.1%7.1% conv. - **cylinder leak down tester kit**9K/yr+12.6%6.2% conv. - **leakdown tester**8K/yr-23.5%5.9% conv. - **leak down tester automotive**6K/yr+6.8%5.0% conv. - **engine leak down tester**5K/yr-0.6%6.2% conv. - **compression leak down tester**4K/yr+22.8%6.0% conv. - **otc leak down tester**5K/yr+6.8%6.3% conv. [**All search terms **](https://flapen.com/research/us/automotive/leak-down-tester/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.
0%5%$21K10%$42K15%$63K20%$84K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**OTC 5609 Cylinder Leakage Tester Kit - Quickly Diagnose Internal Engine Problems like Bad Rings Valves and Leaking Head Gaskets**OTC**$104.96**4.7★2,917 rev](https://www.amazon.com/dp/B0030EVL60) [2**Cylinder Leak Down Tester Compression Test kit - Engine Cylinder Dual Gauge Leakdown Tester kit Diagnostics Tool.**LEIMO KPARTS**$33.27**4.0★1,265 rev](https://www.amazon.com/dp/B07W9FXKTF) [3**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**$34.39**4.2★19 rev](https://www.amazon.com/dp/B0GGXBNMJB) [4**TU-21Cylinder Leak Down Tester Kit Automotive Engine Compression Leakage Test Kit for Cars Trucks Motorcycles (Black)**Yonligonju**$25.56**4.3★1,233 rev](https://www.amazon.com/dp/B0DF64L3JF) [5**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**$35.60**4.3★252 rev](https://www.amazon.com/dp/B0B3XQGHDX)
**~~View all top sellers →~~**
### **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**$34.39**19 rev5mo ago](https://www.amazon.com/dp/B0GGXBNMJB) [**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**$135.60**1,866 rev7mo ago](https://www.amazon.com/dp/B0G5PKVZNS) [**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**$26.89**252 rev7mo ago](https://www.amazon.com/dp/B0G48PSZKW) [**Marvelity Cylinder Leak Down Tester Kit**Marvelity**$30.87**112 rev10mo ago](https://www.amazon.com/dp/B0FFSGPNNF) [**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**$34.27**252 rev1y ago](https://www.amazon.com/dp/B0FGP81FRL)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**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**$135.60**4.3★**▲ 246%**](https://www.amazon.com/dp/B0G5PKVZNS) [**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**$34.39**4.2★**▲ 207%**](https://www.amazon.com/dp/B0GGXBNMJB) [**Gnhydxfe TU-21 Engine Cylinder Leak Down Tester Kit Automotive Engine Compression Leakage Test Kit for Cars Trucks Motorcycles (red)**Gnhydxfe**$17.84**4.0★**▲ 141%**](https://www.amazon.com/dp/B0DF6417DJ) [**TU-21Cylinder Leak Down Tester Kit Automotive Engine Compression Leakage Test Kit for Cars Trucks Motorcycles (Black)**Yonligonju**$25.56**4.3★**▲ 97%**](https://www.amazon.com/dp/B0DF64L3JF) [**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**$26.89**4.3★**▲ 82%**](https://www.amazon.com/dp/B0G48PSZKW)
**~~View all trending →~~**
## **What buyers say about leak down tester**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**21%
*“Top notch quality on a budget”*
**Value For Money**17%
*“Good value for the price”*
**Advertised Vs Actual Product**11%
*“Works as advertised”*
**Leak-Proof**10%
*“Affordable leakdown kit for DIY use”*
**Ease Of Use**6%
*“Easy to use”*
**Measurement/Reading Accuracy**5%
*“Accurate, Durable, and Easy to Use”*
**Efficiency**4%
*“it responded well”*
**Pressure**4%
*“This cylinder pressure test kit looks great”*
**Compression**3%
*“Excellent Kit for Compression”*
**Functionality-Overall**3%
*“functional to use good value for the money”*
### **What buyers complain about **
**Quality-Overall**17%
*“The overall quality feels cheap”*
**Leak-Proof**15%
*“has a 100% leak rate”*
**Functionality-Overall**11%
*“Will return guage failed to work”*
**Measurement/Reading Accuracy**10%
*“which makes getting an accurate reading nearly impossible”*
**Pressure**6%
*“There is no pressure differential between the gauges”*
**Instructions/User Manual/Troubleshooting**5%
*“Instructions were poorly written”*
**Compatibility-Overall**4%
*“Will not work for 2v or 3v triton motors”*
**Size-Overall**3%
*“Poor fitting on flexible hose”*
**Defective Material/Parts**2%
*“defective unit”*
**Advertised Vs Actual Product**2%
*“False advertisement”*
### **Top return reasons **
**Leak-Proof**20%
**Pressure**13%
**Measurement/Reading Accuracy**13%
**Functionality-Overall**13%
**Size-Overall**8%
**Defective Material/Parts**7%
**Compatibility-Overall**6%
**Advertised Vs Actual Product**3%
**Compression**2%
**Value For Money**2%
## **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.
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