| http://www.w3.org/ns/prov#value | - Keep in mind that the low end on many common pressure switches in around 25-30 PSI. That might be a bit higher than you want for a low end shut off, especially if your system will be operating at less than 45 PSI. You don???t want accidental ???false??? shut offs since the only way to get the system back on will be to manually start the pump and hold it on until the pressure is back above the shut
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