There is a drilling in the side of the plug in which you can put a size 3 Allen key or a Torx key T10 (usually found in the your BMW toolkit) in order to fit and remove it.
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Also referred to as oil filler cap.
Perfect protection for your cooler which looks nice, made of...
Cover for the foot brake fluid reservoir, CNC machined of...
This cover for the open hole beyond the swingarm pivot is...