This direct drive vacuum pump provides the best performance / cost ratio available today. This vacuum pump draws 29-1/2" HG. It has a 2-stage rotary sliding vane type and produces 1 micron ultimate pressure. Unit has a gas ballast to help purge moisture from vacuum system and a trap to reduce risk of oil being sucked back into the system. This model has a voltage of 110V. Pump speed is 1,725 rpm. Intake ports are 3/8" OD. Furnished with vacuum pump oil. Very reliable and low maintenance. Shipped wired for 110V. Made in USA.