Oil filler plug with emblem R1100 and R1150 4V-Boxer bikes
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.
Comes with Hornig Emblem.
Will Fit all 4 Valve models such as
R850, R1100GS/RT/R/RS, R1150GS/RT/R/RS
Made by the German company Hornig.
Stock image used, actual product may vary slightly.