As a result of my tests I determined that THIS remanufactured diesel vacuum is a must-have for anyone who works on diesel engines .It is durable and reliable, and it has greatly improved the performance of my air conditioning system. The installation process was easy, and the instructions were clear. The only con that I can think of is that it might be a bit expensive for some buyers, but the quality and effectiveness of the product more than make up for the cost. Overall, I highly recommend thiSee full review