– general purpose indoor universal design serves the widest variety of applications for starting or stopping electrically operated equipment such as signal lights, alarms, motors, automatic burners, metering devices and others. Sensitivity adjustment screw for easy flow adjustment. Single pole, double trhorw snap switch. Includes 4 stainless steel paddles: 1″, 2″, 3″, 6″. Maximum pressure 160 psi. Nema 1 case.