Ok so I have found where everything goes except this? Do you guys know what this is? It looks like it connects to something on the bottom with that o-ring?

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 2001 5.4 Screw 4x4,6 inch trailmaster lift,Chickenears intake,Lightning grill and headlights,Autometer Tranny temp gauge,boost gauge Wideband A/F,Kanamari ram air hood,lightning motor swap,xcal3 tuned by Justin @VMP.
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