Keep it dry! These breather patches allow air to vent out of a headlight, but block moisture from coming in. This is a big help in preventing condensation from building up inside. Available in packs of 4 or 40 units, the circle stickers are 20mm in diameter, or just over 3/4 inches. They are designed to be placed over a 1/2 inch hole.
We recommend using two per lamp to provide maximum airflow. To install, drill a 1/2 inch hole on your lamp. We recommend placing at the side, but you can choose anywhere that has a flat surface. Clean the hole and stick on the patch, holding firmly for 5 seconds to ensure good adhesion. That's it! Details: