When running fuel pumps on the Model T's and Model A's, you normally need to cut back the fuel pressure. This regulator does the trick, the knob on the face turns easily to adjust the fuel pressure from 1 to 5 lbs. This regulator has 1/8" female pipe threads in and out. Includes 3 pairs of brass hose barb fittings for 1/4", 5/16" and 3/8" rubber fuel line.