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Cummins - Yes, they are that type. The bolt seen just above the plate goes into a cast disc. The disc has a nut welded to the top. That weld failed, allowing the disc to drop and the disc was holding the sleeve up. When the sleeve dropped it bent - I think giving a shock to the seals which caused (or allowed) the pistons to drop. The rebuild took care of the problem. The dealership had told me replacement cylinders were not available from Lippert and the parts for the new system would be $1400. I had them inspect the weld on the nut on the other side, and maybe that's something to check annually
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