Where does the hole at the base of the wiper lead to?

[HannahDella]

The hole at the base of the wiper leads to the outside of the vehicle. Here is an introduction about wipers: 1. Introduction: The windshield wiper (WINDSHIELD-WIPER) is a blade structure installed in front of the windshield, composed of an electric motor, reducer, four-bar linkage, wiper arm spindle, wiper blade assembly, etc. 2. Function: Its main purpose is to remove rain, snow, and dust from the windshield that obstruct the view. 3. Principle: The power source of the wiper comes from the electric motor, which is the core of the entire wiper system. The quality requirements for the wiper motor are quite high. It uses a DC permanent magnet motor, and the wiper motor installed on the front windshield is generally integrated with the worm gear mechanical part.