It is actually dual purpose "guard" for the bottom mounted drain plug, and also serves as a convenient jacking point. We put a custom drain on the bottom of the housing so servicing doesn't require soaking your air in gear lube, there is also a large filler cap on the top that we put on custom (it's standard on all of our housings) fill cap on the top so you don't have to fuss with squirting it in the small plug hole on the side of the gear carrier.
It's the little things, in addition to the big things....
Mark
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