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What is the current pressure without the pressure reducer. you can adjust it down to 55 and see if it does it again. if it does it can be one of two things you have the wrong unit for you application or the new unit is bad
ok that unit comes from watts set at 50 pounds. what I need you do to do is get a gauge that goes to 180. then adjust the pressure valve back to 50 pounds. if it doesn't take adjustments the new unit may be bad.
I forgot to tell you, make sure the gauge is on a line the pressure valve will reduce. if your hooking up to a outside hose bib. Be aware some hose bibs are before the reducer.
I will have my tablet with me so it should just come back to me.