This part is listed by BMW as BMW part number 11537843273 (11 53 7 843 273) and is described as the coolant hose to the auxiliary water pump on F10 M5 and F06/F13 M6.
This is a Genuine BMW S63 coolant hose with a two year warranty. Buying a Genuine part will usually be more expensive than an OEM or aftermarket brand but you are assured that it meets BMW's designs for fitment, performance, and longevity. It will also be the very latest design, incorporating any updates or revisions that an aftermarket brand typically will ignore.
For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.
F10 / F11 (11-16) > M5 (2013-2016)
F12 / F13 (12-18) > M6