Looks a lot like an air separator/regulator/oiler for an air compressor.
Is there a small pump in the housing? The shroud looks like it's a "finger in pulley" preventer. If so, it's a small compressor with a large sep/reg/oiler.
uh, I think you have the bud light platinum triple filter!!
__________________
You start with a full bag of luck and a empty bag of experience, your goal is to fill the bag of experience before you empty your bag of luck