I am looking at a used compressor and I am looking for some input. It is a Mako that has a 3 hp Briggs and a Purus compressor. The engine runs like a top and I am going to fill a tank to be sure it will pump to 3000 psi(not going to breathe the air until I send it in for a test.) The guy says he has a $ amount in mind but wants to know what its worth to me. I have no idea what these units are worth if it works fine. It is a 1977 model purchased 5-78. I dont know how many hours are on it but I know it hasnt been used in the last few years at all. I am not looking to fill a ton of tanks, just more of a convenience factor more than anything.