The Smith Meter® Model DE-3 Air Release Heads are an electric float switch device for installation on a model AR or VAR air eliminator tanks. They are intended to be used in metering systems where air entrapped in the product is particularly troublesome (e.g., pumping off tank trucks and barges). The triple float switch air release head provides a unique method of air elimination designed to function in an unloading or Petro-gard II system. The elimination of air from liquid product is essential for accurate metering. The DE-3 is used in conjunction with the AccuLoad Preset controller that operates the control valve, air eliminator solenoid and pumps. With the probability of a large slug of air at the beginning and end of the batch, and possible entrapped air during the batch, the operation of the air release head functions to remove the air as it accumulates in the tank. The three float switches suspended at different levels in the tank sense the level of fluid and perform the appropriate functions as programmed in the AccuLoad.