Machined billet aluminum reservoir has the classic finned look of  for lighter weight and passive cooling. Reservoirs hold 4 fluid ounces for brake or clutch master cylinder. Billet clamps, stainless flex lines, and fittings available for remote mount to Wilwood Remote Tandem or Compact Remote Master Cylinders, or mount directly with a 9/16-18 to 11/16-20 fitting and O-ring.