The Soldering Filter Drier EK-165S 1/4 is a device used in HVAC (heating, ventilation, and air conditioning) systems to remove moisture and debris from the refrigerant before it enters the compressor.
It is typically installed in the liquid line of the refrigeration system to ensure that the compressor is protected from damage caused by moisture and debris.
The 1/4" designation refers to the size of the connection on the device.