This has crimp dies for the most common sized hoses and fittings. I have used it on two cars and have had leaks on both.
where do you purchase the hoses and connectors? I use it for high pressure water hose but i get the couplers (connectors) here. http://www.pressurewasherstuff.com/pressure-washer-hose/clamps-and-couplers/reusable-hose-couplers-for-68-to-70-od.html. I do believe amazon has them too but this is the best price i have seen. Also you cam get the hoses at any hardware store Where can I get a kit with hoses and fittings? Hoses, fittings and kits are available from a number of parts suppliers online. I've used Speedway, Summit, and Vintage. With some experience, you will figure just what you need and source it. Will this crimp steel ac hose fittings? absolutely