It's a cheap hose...it goes from the bottom of the CCV to the dipstick. You can replace it without removing CCV...not too bad...I am not looking up the part number, you can do that on RealoOEM or FCP Euro....

You CAN change just the drain hose, but if it is cracked, the rest of your CCV is likely due for a replacement.

__________________
'03 530i - manual swapped - 425k miles
'06 325Cic auto 115k
'05 X5 3.0 auto 158k
'99 E39 528i 5-speed 130k