The Haas Liquid Grease lubrication system uses adapter fittings  in the axis manifolds. The linear guide trucks and ballnuts use restrictor fittings . The restrictor fitting has a gap  between the threads and the set screw . This forces the manifold-fed grease to pass through the gap  to lubricate the axes.
Note: The copper tubes on this system may or may not be equal length.
Caution: Do not change the length of the copper tubes or flexible plastic tubing. This changes the flow of grease.