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What is the first thing that should be done before using a pneumatic tool?

  1. Drain the water from the compressor.

  2. Drain the oil from the compressor.

  3. Put a couple of drops of oil into the tool where the air hose attaches.

  4. Put a couple of drops of water into the tool where the air hose attaches.

The correct answer is: Put a couple of drops of oil into the tool where the air hose attaches.

Before using a pneumatic tool, it is important to lubricate the tool to ensure smooth operation and prevent damage. This should be done by putting a couple of drops of oil into the tool where the air hose attaches. Options A and B are incorrect because draining water or oil from the compressor would not properly lubricate the tool. Option D is also incorrect as water should not be added to the tool, as it can cause corrosion and damage. The best practice is to use oil specifically designed for pneumatic tools for proper lubrication.