JB Industries DV-85N Vacuum Pump Platinum Series is a high quality, dependable, and efficient 3 CFM HVAC vacuum pump. The JB Industries DV-85N features a check valve to prevent oil back flow during a power failure, 2 stage pump to achieve deep 15 micron vacuum pull, stainless steel valving to help resist corrosion and promote long pump life, and all brass fittings.