This is an air oil separator for an Atlas Copco air compressor.
It is a vital component that enhances the efficiency and longevity of HVAC and refrigeration systems.
It works by separating oil from gas or refrigerant mixtures.
The oil mist is liquefied into droplets that collect at the bottom, then filtered and sent back to the system.
The replacement part numbers can vary, but common ones include 1604038300, 1613901400, 2901196300, 1622314001, and .
It uses high-efficiency materials, such as US HV or Ahlstrom brand glass fiber, to achieve filtration of 0.1μm with a 99.99% efficiency rate.