Charlie, Thanks for the response. I need to be more involved with this forum so, I can stay better informed. Can you tell me who Bill is? While I am operating without any form of time constraint I had better use this opportunity to inform myself about low-pressure turbo applications of the rotary. By low-pressure, I mean 7-8 psi. However, I have no experience with the rotary so, low-pressure may carry a different meaning in this application. Rick