This Square D 9012GAR5 single-stage diaphragm-actuated pressure switch for machine-tool applications has a 3-150 psi range on decreasing pressure and 6. 0-30. 0 psi adjustable differential for control circuit applications in pneumatic and hydraulic systems. The NEMA 7 and 9 enclosure has a zinc-plated steel diaphragm housing. The switch is Underwriters Laboratories (UL) Listed and Canadian Standards Organization (CSA) certified. It has a 1/4"-18 NPTF pressure connection. Square D pressure switches are manufactured by Schneider Electric. Square D brand pressure, float, and limit switches have been synonymous with safety, quality, and reliable performance for over 100 years. First launched by Detroit Fuse and Manufacturing in 1902, the Square D brand and its products continue to earn customer trust today.