Square D,PRESSURE SWITCH 575VAC 1HP F +OPTIONS,0.25 inch NPSF internal conforming to UL 508,100 psi,20 psi,40...100 psi,off at 100 psi,220 PSIG,A600,DPST,General Purpose (Indoor),NEMA 1,Pressure Switch,Pumptrol,Screw Clamp,UL listed, CSA,air (-22...257 .F),control small electrically driven air compressors,pulsation plug-2-way pressure release valve