The Model DA disc aerator from BlueLevel Technologies combines both aeration and gentle vibration, making it one of the best fluidizers available. The 4-inch diameter aerator uses FDA-compliant silicone in either blue or white. The hardware is zinc-plated steel. Unlike other disc aerators on the market, the unique Model DA disc covers the air openings in the air inlet pipe reducing possible material backflow into the air lines. Each Model DA disc aerator can aerate an approximate 20-24-inch diameter area and is designed for periodic operation using higher 20-30 psi air pressure than standard rectangular pads. The Model DA disc aerator can mount from inside or external to the bin. External mounting kits are available to replace rectangular, oval and round aerators from outside the bin with ease.