The bubbler tube open end is found in which wastewater equipment?

• A. Lift station wet well
• B. Air relief valve
• C. Sewer cleaning truck
• D. Pump station dry well

Answer: (A)

Bubbler tubes measure liquid level by using an air line whose open end is submerged in the liquid. The pressure inside the tube reflects the height of the liquid column above it, so the control system can determine the wastewater level and operate pumps accordingly. In wastewater systems, this open end is placed in the wet well of a lift station, where the liquid level directly controls the pumps. The other options don’t provide a submerged sensing end: an air relief valve vents air, a sewer cleaning truck is a service vehicle, and a dry well is a dry chamber not used for level sensing with a bubbler.