The AZ pumps are also rebuildable. It's a better design. They have not had the failure rate of Viairs. When a problem was found in the initial run they replaced all without any delay. The customer service is better. If a pump goes out there is a real warranty unlike ViAir. They are a true 100% duty cycle at a realistic pressure unlike ViAir that is 100% at a low presure. I know Jimmy at Center Stage sells them. And I know First Class Autowerks
http://www.firstclassauto.net sells them because they are doing the rebuild on the company mazda.