We installed the supplied surface-sealing AN -6 adapters at our Flaming River rack, and assembled the pressure hose (from assist unit to rack) and the return line (from rack to pump housing). The return-line fitting gave us two small problems: One was that the rack-fitting size overlapped the fitting for the rack transfer tube (the two metal tubes in the photo that move the fluid in the rack). We had to carefully grind down the fitting, which took all of 5 minutes. The second problem was how to work with an AN -6 fitting and a return line that used hose barb. The answer was to use a spare Mr. Gasket push-lock AN -6 fitting from our fuel system install, which worked like a charm.