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how do I measure pump cutoff on the Riello?

alias2102 Member Posts: 10
edited March 22 in Oil Heating
I do have a Riello manometer and vacuum tester. However, it doesn't fit the nozzle port or a nozzle line. Could you suggest an adapter size?
Usually, you'd connect the 3/16" flare fitting, but Riello is all metric.

Thank you