Square D,PRESSURE SWITCH 575VAC 1HP F +OPTIONS,0.25 Inch NPSF,20 psi,40...100 psi,220 PSIG,A600,DPST,General Purpose (Indoor),NEMA 1,Pressure Switch,Pumptrol,Screw Clamp,UL listed, CSA,control small electrically driven air compressors,maintained manual cut-in lever (AUTO-ON)-2-way pressure release valve