Honeywell Pressuretrol Pressure Controller, 0.5 to 9 PSI Control Range, SPST Switch, Snap-Acting, 1 to 5 PSI Differential, Enamel, Gray, 4-15/32 inch height x 3-3/8 inch Width x 2-1/4 inch D
The PA404 is a series 40 (2-wire, SPST) pressure controller for use inch 24, 120, 240 or 277 volt control circuits or inch self powered (millivoltage) applications.