Mystery Part on top of Windshield Washer Reservoir

[Toothbrush]

While prepping to fix a leak in the windshield/windscreen washer system, I noticed a part mounted on top of the reservoir, but have no idea what it is or what it does. I've looked through a bunch of threads/online/RealOEM/ISTA/TIS, etc, but still stumped. Here are some pics.


Help is appreciated! Part is circled/pointed at in red. Is it some type of filter? Does it need a second hose or is that one side (facing the rear of the vehicle) supposed to be open?

[Qsilver7]

You left no model/model year information...which makes it impossible to look up anything to share with you.

Help us help you better...either create a signature that includes your model/model year/build date...or remember to include it when you post and you need others to help find information to share with you.

[Toothbrush]

Originally Posted by Qsilver7

You left no model/model year information...which makes it impossible to look up anything to share with you.

Oops!


Added a signature.


(2007 4.8i)