The Dwyer Instruments 1820-20-PRESET Pressure Switch is a metal pressure switch designed for interior use. It features a vertical orientation, on/off operation method, and a differential switch type. This pressure switch is suitable for instruments and has a stainless steel finish. Made in the United States by the trusted brand Dwyer, this switch is compatible with wire gauges ranging from 1-5 AWG and has a screw termination type for easy installation. With a coil voltage of 1-10 V and ideal for AC current type, this pressure switch is a reliable choice for various industrial applications.