Right can I ask a potential stupid question here too...
I thought the idea with diff breathers was to allow the diff to breathe "IN" during water crossings - the theory being:
You're banging along and your diff is warm/hot (depending on how much of a hard time it's getting from ya!) then you come to a (Brrrr) cold stream and in you go... Now the diff gets a cold bath, this causes the "reverse" of the "hot gas venting" effect ie. the inside of the diff cools and contracts, and you get water into the diff because
a) the factory breather is underwater
and / or
b) the breather is "one-way" and slams shut, but the laws of physics win and pressure sucks water in through the axle seals.
THE POINT TO ALL THIS - if you fit the original "one-way" breather to the end of the extension and mount it higher up, you haven't really done the full job?
Yes or no? I'm asking not telling!
Shouldn't the end of the extension be doubled over and fitted with a bit of screen or a "two-way" filter etc.