With industrial grade technology, NP12DM solves the problems of long-time evacuation, inadequate vacuum level in the service for large commercial refrigeration or central AC systems. The dual stage rotary vane pump and inverter motor lead to faster evacuation and a deeper vacuum. Integrate pump structure and built-in oil back-flow prevention assure superior performance and reliability. The combination of enhanced technology and aesthetic design enables the NP12DM to be a top-class product.