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The leak detector is connected to the venting connection of the endoscope. This location is critical because the venting connection is designed to allow air to be expelled from the instrument, which is essential for maintaining a proper seal during the leak testing process. By connecting the leak detector here, technicians can effectively assess whether there is any breach in the integrity of the endoscope's components, which is crucial for ensuring the device is safe and functional for patient use. This connection allows for precise detection of any potential leaks that could compromise the effectiveness of the scope during procedures, thus playing a fundamental role in infection control and patient safety.

In contrast, connecting the detector to the insertion tube, control knobs, or light source would not provide accurate monitoring of leaks, as these areas do not serve the purpose of pressure equalization or air passage that are integral to effective leak testing.