oil leaks. I have to pay to ship the product for the repair and it failed within the first 30 days (and the company knew about it). I did a great job but we had to fill the piston pump 2 or 3 times a day to get it pumping air. We had oil in the switch and the equipment (it was food processing equipment by the way) and we had to clean it thoroughly before handing the job over to the customer. It's a rip off that you have to buy a tool and then pay shipping to have it fixed. I'll probably replace this for the next big job and use it for trot line loads.