I have purchased this since my office vacuum pump died after serving for 20 years. It was lower cost option and since I'm looking to retire in a few years, I figure I buy something not too fancy. The product was delivered and installed by my technician. Then the level of suction was so weak. I reached out to Azdent and they kept asking me send video after video.. The last video they requested was one showing suction power of the unit directly to a bucket of water. It was still very weak. I called my technician a couple of times to try different things. At the end, I just decided to buy another unit made by a brand that's better known. I might have spent less to buy this but Azdent doesn't cover return cost even when the unit doesn't work as described( It says on their website, this has 'powerful suction') and I don't have time to somehow package this thing and take it to a post office..... I have bought some other Azdent products and they are hit or miss. Obviously this is a miss...