When attaching the mask mounted regulator to the face piece in what position must the red purge valve initially be when viewed from inside the face-piece?

When attaching the mask-mounted regulator to the face piece, the red purge valve should be positioned at the top when viewed from inside the face piece. This alignment ensures proper functionality and allows for easy access in case of an emergency. Proper positioning also aids in preventing any obstruction to the user's field of vision.