What Is an Aftercooler and Why Does Your Air Compressor Need One?

If your air compressor is producing hot, moisture-heavy air, you could be putting your tools and equipment at risk. That’s where an aftercooler comes in handy; a simple upgrade that makes a big difference in performance and air quality.

What Does an Aftercooler Do?

An aftercooler is a type of heat exchanger that cools down the compressed air coming out of the pump before it reaches your tank or tools. By lowering the temperature, it reduces the amount of moisture and condensation in the air supply.

Why Is That Important?

Without an aftercooler, hot air from the pump retains more water vapor. As that air cools in the tank or lines, moisture condenses, leading to:

Rust inside your tank and air lines
Water-damaged tools or spray finishes
Reduced lifespan of pneumatic tools

An aftercooler helps:

Improve air quality
Extend equipment life
Reduce maintenance and downtime
Enhance overall system performance

How to Use It

The aftercooler installs between the pump outlet and the air tank inlet. It requires:

Knowing your model number so you purchase the correct aftercooler for your pump
Proper placement to allow airflow over the cooler’s fins
A secure, sealed connection to avoid leaks
Optional fan installation for increased cooling efficiency

Product Highlight

Whether you're replacing a damaged unit or upgrading your setup, this OEM aftercooler ensures cleaner, drier compressed air for your T35/39 pump (you will want to know your model number when shopping for aftercoolers).

May 22, 2025 Master Tool Repair

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