Is coolant vacuum refill kit profitable to sell on Amazon United States?

The niche generates $461K/yr across 34 tracked products. 5 of 8 products launched in the last 360 days are still selling. 90-day search growth is -21.0%. Flapen's verdict: Worth a look (50/100).

How competitive is the coolant vacuum refill kit niche?

17 brands and 64 sellers compete. The top 5 products take 46% of clicks and top 5 brands hold 75% of demand.

What do buyers complain about in coolant vacuum refill kit?

Top complaints mined from reviews: Quality-Overall, Leak-Proof, Compatibility-Overall. The return rate is 3.4%.

When does demand for coolant vacuum refill kit peak?

Demand peaks in Jul; the busiest month runs 1.9× the quietest.

What does it cost to enter the coolant vacuum refill kit niche?

Listings span $14.81–$150.45; the average listing price is $50.72 (sweet spot $15–$100). The average incumbent carries 1,264 reviews — the moat a new listing must climb.

coolant vacuum refill kit

Worth a look

Shows a sweet-spot price point ($50.72 avg), but soft demand (-21.0% this quarter) keeps it on the watch list.

Avg price

Great$50.72

avg listing price — sweet spot $15–$100

Quality gap

Good4.3★

avg incumbent rating — lower means beatable quality

Competition

Good46%

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

Price range

Good$14.81–$150.45

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

Market size

Good$461K

$461K/yr · 528K searches

Review moat

Good1,264.41

avg incumbent reviews — the moat a new listing must climb

Brand share

Good75%

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

Returns

Okay3.4%

return rate — above 5% kills the launch gate

Conversion

Bad1.7%

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

Growth

Bad-21.0%

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

Signals High Price

According to Flapen's Amazon United States niche tracking, coolant vacuum refill kit is a $461K/yr Amazon United States market (528K searches/yr). The top 5 brands hold 75% of demand. Demand peaks in Jul. Verdict: Worth a look — 50/100.

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

coolant vacuum refill kit market data

Units sold / yr: 8K–10K; avg 100–250/product
Revenue / yr: $406K–$507K; units × avg price
Conversion rate: 1.7%
Avg BSR: #75
Page quality: 0%
Prime: 100%
Sponsored: 97%
Out of stock: 5.0%
Avg brand age: 55 months
Avg seller age: 151 days

Competition & brand share

The top 5 products take 46% of clicks — established leaders, but buyers still shop beyond them.

Brands

17 falling

Sellers

Top-5 brand share

75%

Top 20: 100%

Top-5 click share

46%

Top 20: 87%

Open market

20%

Orion Motor Tech33%
OEMTOOLS25%
UView6%
BILITOOLS6%
CXPRO5%
DAYUAN5%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -21.0% search growth over the last 90 days.

Peak months: Jul · busiest ÷ quietest = 1.9×

Open Trend

Top coolant vacuum refill kit search terms

oem tools215K/yr -23.9%0.2% conv.
coolant vacuum refill kit108K/yr -18.1%3.1% conv.
oemtools34K/yr -3.3%0.2% conv.
oem29K/yr -7.9%0.0% conv.
vacuum coolant fill kit22K/yr -19.7%3.4% conv.
coolant vacuum filler9K/yr -1.5%3.1% conv.
coolant refill kit13K/yr -18.7%2.7% conv.
cooling system vacuum fill tool16K/yr -37.9%3.2% conv.
radiator vacuum fill kit12K/yr -17.2%3.9% conv.
airlift coolant refill tool9K/yr -13.3%4.2% conv.

All search terms

Top coolant vacuum refill kit 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 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

OEMTOOLS Coolant Vacuum Refill Kit Coolant Pressure Tester Kit 5 Adapter

OEMTOOLS$93.114.4★2,361 rev

Orion Motor Tech Coolant Vacuum Refill Kit 13pc Radiator Cooling System Tool Set with Conical Adapter 4 Round Adapters for Leak Detection Cooling Refill Vacuum Coolant Fill Kit with Hose Black

Orion Motor Tech$45.624.3★85 rev

Orion Motor Tech Coolant Vacuum Refill Kit 13pc Radiator Cooling System Tool Set with Conical Adapter 4 Round Adapters for Leak Detection Cooling Refill Vacuum Coolant Fill Kit with Splashproof Hose

Orion Motor Tech$46.774.3★85 rev

Orion Motor Tech Coolant Pressure Tester Kit 33pc Master Coolant Vacuum Refill Kit with 23 Radiator Adapters Radiator Cooling System Pressure Tester Kit with Vacuum Pump Vacuum Purge & Refill Tool

Orion Motor Tech$72.644.3★650 rev

UView 550000 Airlift Cooling System Leak Checker and Airlock Purge Tool Kit OEM Approved Universal Connectors Minimum 90 PSI/60 Bar Used for Leak Detection Purging Airlocks A/C System Refill

UView$150.454.7★1,740 rev

Newest

by launch date

Alltooetools Coolant Vacuum Refill Kit Radiator Cooling System Vacuum Refilling Gauge Tool with 32mm 35mm 40mm 45mm Apdapters

Alltooetools$27.832 rev

5mo ago

Orion Motor Tech Coolant Vacuum Refill Kit 13pc Radiator Cooling System Tool Set with Conical Adapter 4 Round Adapters for Leak Detection Cooling Refill Vacuum Coolant Fill Kit with Hose Black

Orion Motor Tech$45.6285 rev

6mo ago

VEVOR Radiator Vacuum Refill Kit Automotives Cooling System Vacuum & Purge Fill Tool with Gauge Portable Radiator Coolant Filling Kit with Toolbox Universal Fit for Most Cars Vans SUVs and Trucks

VEVOR$28.8147 rev

8mo ago

BILITOOLS 10-Piece Coolant Vacuum Refill Kit Quick Airlift Coolant Refill Tool for Most Vehicles

BILITOOLS$46.7813 rev

10mo ago

Orion Motor Tech Coolant Vacuum Refill Kit Cooling System Vacuum Fill Tool with Leak Detector 5 Round Adapters 1 Conical Adapter Radiator Coolant Fill Kit with Dual-Movement Gauge for Vacuum Leak

Orion Motor Tech$66.8081 rev

11mo ago

What buyers say about coolant vacuum refill kit

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

What buyers love

Quality-Overall20%

“nice quality set”

Ease Of Use10%

“Pretty handy”

Value For Money9%

“Great Value”

Coolant9%

“worked well for my coolant change”

Efficiency7%

“Works ok”

Advertised Vs Actual Product7%

“As advertised”

Leak-Proof6%

“Did not leak”

Size-Overall6%

“Excellent fit”

Durability2%

“Worked very well, durable and easy storage”

Pressure2%

“it held pressure consistently during testing”

What buyers complain about

Quality-Overall13%

“Cheap quality”

Leak-Proof12%

“leaking”

Compatibility-Overall12%

“adapters that were not compatible”

Size-Overall7%

“Not large enough”

Coolant6%

“leaked coolant everywhere”

Pressure5%

“Does not pressurize system”

Functionality-Overall4%

“Did not work as stated”

Instructions/User Manual/Troubleshooting4%

“Terrible Instructions”

Value For Money3%

“Not even worth any money”

Advertised Vs Actual Product2%

“Was not advertised as such though”

Top return reasons

Size-Overall20%

Compatibility-Overall18%

Coolant13%

Defective Material/Parts8%

Functionality-Overall7%