Dwyer Series CXA water pump pressure switches have been proven reliable for controlling automatic water systems-ideal for water well pumps and pumping systems. Easily adjust set point and deadband via screws inside the cover. Pump control for water systems suitable for all types of electrically driven water pumps: jets, submersible, reciprocating. Direct acting (NC) or reverse acting (no) available depending on switch Type and model number. Simple to install - mount in any orientation.