As the material is pumped out, the vacuum below the airtight piston pulls the piston along with the product while wiping the tank sidewalls clean. Because the material level can be easily viewed, customers use more product when compared to other containers. When completely discharged, only 5 or 6 gallons remain in the 400 gallon piston bin. Tare weight 320 lbs. Air pressure used to simulate filling and discharging.
Orange piston moves up and down.
Orange piston removed, inspected and reinstalled. Tip over test with bin full of water.