3/8 transmission cooler hose
Skip itA small market ($62K/yr) — this niche doesn't clear our bar today.
Conversion
Great10.2%search→purchase rate — share of searches ending in a sale
Avg price
Great$18.41avg listing price — sweet spot $15–$100
Returns
Great1.9%return rate — above 5% kills the launch gate
Review moat
Good635.77avg incumbent reviews — the moat a new listing must climb
Price range
Good$8.41–$32.09cheapest to priciest tracked listing — scored on the share inside $15–$100
Growth
Okay+11.6%90-day search growth — must beat 0% to launch
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Competition
Okay65%top-5 click share — leaders hold, buyers still browse
Brand share
Okay89%top-5 brand share — brands hold most of the demand
Market size
Bad$62K$62K/yr · 33K searches
According to Flapen's Amazon United States niche tracking, 3/8 transmission cooler hose is a $62K/yr Amazon United States market (33K searches/yr). The top 5 brands hold 89% of demand. Demand peaks in Mar. Verdict: Skip it — 47/100.
Data updated Jul 9, 2026 · scored weekly · How we score niches
3/8 transmission cooler hose market data
- Units sold / yr
- 3K–4K
- avg 100–250/product
- Revenue / yr
- $55K–$74K
- units × avg price
- Conversion rate
- 10.2%
- Avg BSR
- #210
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 91%
- Out of stock
- 0.0%
- Avg brand age
- 52 months
- Avg seller age
- 189 days
Competition & brand share
The top 5 products take 65% of clicks — established leaders, but buyers still shop beyond them.Brands
11 rising
Sellers
23
Top-5 brand share
89%
Top 20: 100%
Top-5 click share
65%
Top 20: 98%
Open market
8%
- EVIL ENERGY47%
- Boltigen16%
- dojobkinb15%
- Byredio7%
- Eunice4%
- CHOIMOON3%
- Open — no brand owns it (5 brands, 8%)
Demand & seasonality
Weekly Amazon search volume, last 65 weeks — +11.6% search growth over the last 90 days.Peak months: Mar · busiest ÷ quietest = 1.6×
Top 3/8 transmission cooler hose search terms
- 3/8 transmission cooler hose14K/yr
- 3/8 power steering hose8K/yr
- 3/8 transmission hose7K/yr
- 3/8 oil hose4K/yr
Top 3/8 transmission cooler hose 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 22 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
EVIL ENERGY 3/8 Transmission Oil Cooler Hose 10FT 250PSI SAE J1532
EVIL ENERGY$30.064.6★693 rev
EVIL ENERGY 3/8 Transmission Oil Cooler Hose 5FT 250PSI SAE J1532
EVIL ENERGY$19.724.6★693 rev
3/8 Inch (10mm) ID Fuel Line Hose 10FT NBR Rubber Push Lock Hose High Pressure 300PSI for Automotive Fuel Systems Engines
dojobkinb$10.424.6★5,527 rev
EVIL ENERGY 3/8 Transmission Cooler Hose 5FT SAE J1532 250 PSI Power Steering Hose for Transmission Engine & Hydraulic Oil Cooling Systems
EVIL ENERGY$20.954.4★16 rev
Boltigen 3/8 ID Transmission Oil Cooler Hose 10FT Transmission Cooler Line for Power Steering Hydraulic Systems 300PSI Power Steering Hose SAE J1532 (3/8-10FT)
Boltigen$22.254.6★92 rev
Newest
by launch date
EVIL ENERGY 3/8 Fuel Hose Line 10FT NBR Rubber Push Lock Hose with 10 Clamps Straight SAE 30R7 300PSI
EVIL ENERGY$17.9510 rev
3/8 Transmission Cooler Hose with Clamp 300PSI Transmission Oil Cooler Line SAE J1532 Standards for Power Steering Hydraulic Systems 10Ft
jkorytko$19.854 rev
3/8 Inch (10mm) ID Fuel Line Hose 10FT NBR Rubber Push Lock Tubing High Pressure 300PSI for Automotive Fuel Systems Engines and Gas Transmission Line
TUBPRO$9.8441 rev
EVIL ENERGY 3/8 Transmission Cooler Hose 5FT SAE J1532 250 PSI Power Steering Hose for Transmission Engine & Hydraulic Oil Cooling Systems
EVIL ENERGY$20.9516 rev
EVIL ENERGY 3/8 Transmission Cooler Hose 10FT SAE J1532 250 PSI Power Steering Hose for Transmission Engine & Hydraulic Oil Cooling Systems
EVIL ENERGY$32.0916 rev
Trending
90-day click momentum3/8 Inch (10mm) ID Fuel Line Hose 10FT NBR Rubber Push Lock Tubing High Pressure 300PSI for Automotive Fuel Systems Engines and Gas Transmission Line
TUBPRO$9.844.4★
EVIL ENERGY 3/8 Fuel Hose Line 10FT NBR Rubber Push Lock Hose with 10 Clamps Straight SAE 30R7 300PSI
EVIL ENERGY$17.954.5★
3/8 Transmission Cooler Hose with Clamp 300PSI Transmission Oil Cooler Line SAE J1532 Standards for Power Steering Hydraulic Systems 10Ft
jkorytko$19.854.2★
EVIL ENERGY 3/8 Transmission Cooler Hose 5FT SAE J1532 250 PSI Power Steering Hose for Transmission Engine & Hydraulic Oil Cooling Systems
EVIL ENERGY$20.954.4★
3/8 Transmission Oil Cooler Hose - J1532 Power Steering Hose 5 FT Ideal for Fuel Hydraulic and Power Steering Applications 300PSI High Pressure
Byredio$12.894.4★
What buyers say about 3/8 transmission cooler hose
What buyers praise and complain about, mined from review topics.What buyers love
“Quality hose and price is great”
“as described”
“Good value for the money”
“Worked to fix my problem”
“Fit great”
“more durable”
“Very good gas hose”
“It has a braided layer to handle the pressure without issues”
“Stopped my leak”
“easy to route”
What buyers complain about
“Poor quality hose”
“And leaked the next day”
“it was 3 short of 10'”
“It broke down”
“thick feel of the EE hose”
“Cheap material”
“Cost me a couple grand for a transmission because the hose rated for transmission fluid blew out”
“Everything I had burst was at 55psi aka stock LS fuel rail pressure”
“Worst thing to buy for fuel”
“it became the color of dark tea”
Top return reasons
Common questions
- Is 3/8 transmission cooler hose profitable to sell on Amazon United States?
- The niche generates $62K/yr across 22 tracked products. 4 of 6 products launched in the last 360 days are still selling. 90-day search growth is +11.6%. Flapen's verdict: Skip it (47/100).
- How competitive is the 3/8 transmission cooler hose niche?
- 11 brands and 23 sellers compete. The top 5 products take 65% of clicks and top 5 brands hold 89% of demand.
- What do buyers complain about in 3/8 transmission cooler hose?
- Top complaints mined from reviews: Quality-Overall, Leak-Proof, Size-Overall. The return rate is 1.9%.
- When does demand for 3/8 transmission cooler hose peak?
- Demand peaks in Mar; the busiest month runs 1.6× the quietest.
- What does it cost to enter the 3/8 transmission cooler hose niche?
- Listings span $8.41–$32.09; the average listing price is $18.41 (sweet spot $15–$100). The average incumbent carries 636 reviews — the moat a new listing must climb.