Using the DeWalt DCE40012 expansion head is a breeze. First, make sure your expander tool is compatible. Just attach the 1 - inch PEX expansion head to the tool. The automatic rotation feature will do the work for you, providing even expansion. When it comes to size identification, look at the color - coded bands and etched measurements. This makes it super easy to pick the right size quickly. As for maintenance, keep it clean after each use. The chrome coating and black zinc plating offer good corrosion resistance, but if it gets dirty, wipe it down gently with a dry cloth. Store it in a dry place to avoid any potential damage. And always refer to the owner's manual for more detailed instructions and safety precautions.