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A is vacuum supply for brake booster
B is vacuum supply for HVAC and Cruise Control (they branch off of each other)
C is vacuum supply FPR and EGR (they branch off of each other)
D you can just put a pipe plug in, thats for the MAP sensor.
Can the nipples be screwed off of the original plenum? I forget, my SR came with some.
It collects the vapors from your fuel tank that create positive pressure in the tank. When the cannister gets to a certain point it purges the vapors into your throttlebody to be burned.