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The PA404 is a series 40 (2-wire, SPST) pressuretrol controller for use in 24, 120, 240 or 277 volt control circuits or in self powered (millivoltage) applications.
Pressuretrol® controller with additive and 1 to 5 psi differential pressure
Pressure Controller 1 psi - 5 psi Adj.
Pressuretrol controller with subtractive 1 to 5 psi differential pressure
Range adj. (0.5-9psi) Pressuretrol with additive differential. Makes on pressure fall at set point.
Pressuretrol Controller w/Add., Bulk
Pressuretrol controller with additive 1 to 5 psi differential pressure