Model PMA is specifically designed for dislodging dust collected in an Electrostatic Precipitator. The tapered mount design conforms to most shaft and adapter designs currently in use, while our piston and bore design produce higher frequency and force, using less air than competitive units. DURABLE - one-piece ductile iron housing and springless design ensure long effective life EFFECTIVE - a proven solution for electrostatic precipitators with internal bore coating for enhanced performance EASY - fits most tapered shafts off the shelf Click on the "BUY ONLINE" button to order the PMA Rapper, or contact us now for more details