There is a hole at the side in order to open and close it in which you can put the 3mm allen wrench or a T10 torx key which usually belong to the tools of your BMW. With these tools you turn the Oil Filler Plug 120° around (the drilling shows in driving direction).
Hornig emblem and BMW emblem included.
Fits: R1150RT, R1100RT, R1150R, R1100R, R1150RS, R1100RS, R1150GS, R1150ADV, R1100GS, R1100S, R1200C, and R1200CL.
Hornig Oilhead Boxer Oil Filler Cap w/BMW Logo
Produced by Hornig of Germany