A 240 volt double pole pressure switch designed to control water pumps.  The pipe fitting is 1/4" NPT (National Pipe Thread Tapered). 
Adjustable 40-60psi
Preset on pressure: 40 psi/ the contacts close at this pressure to send power to the motor/ pump.
Preset off pressure: 60 psi/ the contacts open at this pressure to shut power off to the motor/ pump.
Adjustable pressure: Instructions are under the lid of the pressure switch on how to adjust pressure.
Max pressure: 80 psi
Min pressure: 20 psi
At 230 volt single phase it will handle 2 hp (approximately 1500w),
Main Feature:
Color: Grey shell
Material: Plastic shell & pressed steel frame
Package contains one (1)1 x Pressure Control Switch