Why is this an unusual dry sump tank? How about the fact that it was manufactured by North American Aircraft For the F-86 jet fighter? This was used as a sump tank for the hydraulic system that actuated its speed brakes. Capacity is 2.1 gallons and it has a built-in sight gauge. Aluminum construction. Quick-release cap with strainer and spill drain. An unusual feature is its swiveling pick-up, so under high G loads the pickup is always where the oil is. This is a cool piece! $200 plus shipping.