the union adapts the 4mm barb to the 8mm lineSo the inline barbed connector goes into the e-locker correct? From there could you just connect the ARB tube to the connector? I don't see where the union comes into play. I don't plan on running into 1 tube, was going to do a tube for the diff and one for the e-locker. Thanks for your help thus far, I couldn't tell from your build link/pics how you connected the above pieces to the e-locker.