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It looks like the part number on it is: 43291-60010.
I'm curious what Toyota calls it. I tried to run it through some online parts number data bases, but nothing comes up.
The only thing I can figure is its something to prevent overpressuration of the system. Somehow that must be a risk with the front axle and perhaps reduces the risk of blowing the outer axle seals by allowing for some expansion.
Or maybe, the box assists in keeping the one way valve closed when underwater, thereby making sure water doesn't get into the front axle and past the seals where it could do more damage to the more critical front axle.
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