Piston vibrators use the impact action produced by a moving piston to flex the bin wall. This flexing action loosens material stuck to the wall, allowing gravity to restore material flow. FPLF piston vibrators are air-cushioned piston vibrators. They use a cushion of air to dampen the piston movement, so the piston reverses direction before impacting the vibrator base. Therefore, FPLF series piston vibrators are quieter than the impacting piston vibrators. The FPLF series is commonly used on chutes, channels or tubes, and spiral chute feed hoppers for conveying fine materials such as chemical powders, flour, sugar, etc.