its the "down by the Fire Wall where the Locking System Vacuum "
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sorry it was late my brain was dead. its green in color, round with a port on each end.
i noticed if you blow through it on one side air goes through. if its flipped around you cannot blow through it. what is the correct way to install it inline. . should it be installed so the side you can blow air through is right side up..or does that end go toward the block.