Square D,PRESSURE SWITCH 575VAC 1HP F +OPTIONS,0.25 inch NPT external conforming to UL 508,100...200 psi,200 psi,40 psi,off at 125 psi,2-way pressure release valve,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