Drive communicates with the pump via 9v DC remote control. This ensures safety and eliminates the need of electrical cord between pump and drive that other manufacturers provide. Silent during use. In comparison electric and pneumatic tube expansion systems are noisy. Compact, therefore easy to use inside boiler drums. Compatibility - Same powerpack for all the 4 drives to expand 58” o.d to 4” o.d tube. Very High Torque Developed - can expand large diameter, thick wall tubes in thick tube sheets easily. Long life + low maintenance.