What are the three components of a standard FRL unit and what does each do?

• A. Filter removes particles; Regulator maintains downstream pressure; Lubricator adds lubrication.
• B. Filter removes particles.
• C. Regulator maintains downstream pressure.
• D. Lubricator adds lubrication.

Answer: (D)

A standard FRL unit includes three parts: a filter, a regulator, and a lubricator. The filter removes particles and moisture from the compressed air to protect downstream equipment. The regulator sets and maintains a chosen downstream pressure, giving tools a consistent, reliable supply. The lubricator introduces a small amount of oil into the air to lubricate the moving parts of pneumatic tools, reducing wear and sticking.

So the best answer is the one that lists all three components and describes what each does. The other options only mention a single component and don’t describe the complete unit.