My 2000 Discovery 2 doesn't have a breather tube on the rear axle. I bought some 6mm diameter hose, but it only goes in so far and doesn't really seat itself. It looks like there is a metal insert in there, but it seems like there should be a rubber grommet there also. Anyone run into this?

 

I plan on tapping my axle and running these for breathers.
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Hmmm, hadn't thought along those lines, thanks fish!

 

Make sure you run it somewhere high and dry while you're at it.