[Eyeguy51]

I put this on mine, that is why I recognized it..

Final Drive Breather Relocation Kit, BMW R1250GS / ADV & R1200GS / ADV, 2008-on (Oil & Water Cooled)

Water crossings can be the most exciting part of an off-road adventure on your R1200GS or GSA. Unfortunately with the liquid cooled R1200GS, the final drive can sustain some damage from being submerged. With the Touratech vent relocation

touratech-usa.com

This is the kind of poor engineering that is astonishing on one of the most expensive ADV bikes in the world. Wow you can fix it with a $79 ( !!) rubber hose with a couple of metal threaded fittings. Ridiculous oversight on Motorrad's part and even more ridiculous pricing by Touratech ( yet they are sold out !)