Square D,PRESSURE SWITCH 575VAC 5HP G +OPTIONS,-,0.25 inch NPSF internal conforming to UL 508,20...40 psi,20...80 psi,30...50 psi,80 psi (5...50 psi),5 to 50 PSIG,DPST,NEMA 4,Pressure Switch,Pumptrol,Screw Clamp,UL listed, CSA,Water tight and Dust tight (Indoor/Outdoor),control electrically driven water pumps and air compressors,fresh water (-22...257 .F)-air (-22...257 .F)