Whip Mix Vacu Vestor Used Dental Lab Equipment, Jewelry, Hobby. Works great. Pulls proper pressure needed to properly invest cases and mix stone, unlike others sold on eBay that don't state that unit pulls proper pressure. Fully tested by our in house tech. Only weird thing is pressure gauge starts at 5 lbs does not go all the way down to 0. Othn that works great. Comes w 2 mixing bows and other extra goodies. If new sells for over $1650.00