No clue where this plug goes

[Paulyy___g]

So I was replacing the front left brake line and hose first of all. As I was trying to fit the metal brake tubing (that plugs into the brake hose) behind the shock and under the upper control arm this hose with a white cap/plug came loose and I can't figure out for the life of me where it goes back into.
I circled it in green in the picture below. If anyone can help me I'd really appreciate any help or suggestions, thanks in advance!!

Btw, to the top left almost touching the unknown circled part is the upper control arm right bolt if that's any help

 

[swshawaii]

Front differential breather hose. White fitting is a one way check valve that prevents water from entering if submerged.

Fasten high as possible to the frame allowing enough slack for suspension travel. Tie wraps are more than adequate.

 

[Number4]

There's a small clip that holds it, somewhere in that area. I believe that breather was in the way of one of the nuts when removing the control arm.

 

[Paulyy___g]

SWAHAWAII + NUMBER4 Thank you very much guys, I was driving myself crazy trying to figure out where it went or even came from. It's been a rough few days repairing both upper arms, driver CV axle, inner and outer tie rods both sides, lower ball joints, sway bar links, brake lines and hoses. Seems like the list just grew and grew.

Now a simple walk through would be the icing on the cake, where do I go with it? And yes a small clip did come off also now that I remember. Thanks again