Good Fellows, Thanks for all the valueable input regarding the Rhom-Air system. I was thinking of changing everything out and going to Spring-air cylinders and Robart plumbing. Decided to replace all the plumbing first keeping the Rhom-air cylinders and it is now working great. Think the basic problem was the cheesy Rhom-air selector valve. Liked the idea of the Spring-air cylinders, except that they would always be in the extended position when disconnected, which I did not care for when transporting and storing. Also, I assume that the variable rate Robart valve would only control the retract cycle of the Spring-Air cylinders. Not sure about this. Anyway, am getting around 10 cycles on the larger tank that I installed, which has about 80% more capacity than the old Rhom-air tank. If the system keeps performing as it has I'll stay with it, if not I'll probably go with the Spring-Air Cylinders.