The racking arm includes a housing affixable to a tank side wall. A racking shaft extends through the housing with an inlet pipe coupled to an inside end of the racking shaft, with an entrance offset from a rotational axis of the racking shaft. A control arm is affixed to the racking shaft and can be rotated to cause rotation of the racking shaft relative to the housing and to change the entrance to different elevations within the tank. A clearance groove surrounds the inside end of the racking shaft to facilitate cleaning of the inside end of the racking shaft. The arm can interface with an indexing plate to hold the racking shaft fixed with the arm indicating by its position the orientation of the entrance. At least one leak detection port extends through the housing to indicate whether fluid is leaking between the racking shaft and housing.