I set out to do my clutch slave and master cylinder today. Getting the feeder tube off the master cylinder was really difficult and now it doesn't want to go on/stay on. Either I'm too weak to get it all the way on or the hose is just that far gone. Here's about how far I can get it on:



So would anyone happen to know what part number this is?

 

You didn't specify the year if your car, but you should be able to look it up here:
http://www.realoem.com/bmw/

Here's a link for an '05
http://www.realoem.com/bmw/enUS/show...diagId=21_0197

 

It's a 2003, sorry about that. :P

Called an "Intake line coupling" part number is 21526756149. Pelican Parts calls it a feed line (feeder) thus part of the confusion! Hopefully other google ninjas find this information useful and thank you so much for the link BlwnAway!