The first one arrived dead, but the seller quickly took care of the problem and got me a new pump. It took A LOT of oil changes to get it cleaned out well enough to pull a vacuum as low as is needed for the Harvest Right Freeze Dryer, but it finally did. I like this pump better than the original one that came with the freeze dryer, this one runs cooler and quieter, which is nice as it's in the center of the house.