The Smith Meter® Model DE Air Release Heads are dual-electric float switch devices for installation on air eliminator vessels. The dual floats provide a unique and efficient method of air elimination from liquids, as is essential for accurate metering. Air is gathered in the vessel until the lower float switch is actuated. This causes the air vent solenoid valve to open and signals the block valve downstream of the meter to close. The flow is blocked until sufficient air is eliminated from the vessel to actuate the upper float by liquid. This causes the air vent solenoid valve to close and signals the block valve to open, resuming flow. The DE Head is intended to be used in metering systems where bulk air is particularly troublesome (e.g., unloading off tank trucks and barges, or stripping tanks).