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Thanks Filter30. Yes, everything is and always has been setup per the Riello manual and specs. I have ordered a new dampened pressure gauge in case that might be the issue, but am doubtful anything will change and will still get fast fluctuations on a pressure test. Would like someone to chime...

Greeting all. Have a Riello F5 for a while, love it. Back when it was on a single line system, I could check/dial in the pump pressure and the gauge read and responded to what I would set without much gauge fluctuation. The gauge remained steady at whatever pressure, both pre and post purge...