Bosch pump plumbing question

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kinda sorta found what i was looking for..thanks! next question.. on the DW8 immediately under the first runner of the intake manifold there is an outlet, about a finger's width, and i sincerely forgot to where it is supposed to go.. is it water? or oil? i imagine it's water but i don't want to risk it :/

here's a pic i found online.. in it there's the remaining part of a pipe and jubilee clip attached to said outlet.. also someone knows where it leads to? thanks again guys!