The 120/240V SPDT One Circuit Air Switch w/Timer in Plastic Enclosure These Air Switches provide remote control for one, two or three separate loads. A push button connected to the mechanism with a flexible air hose enables the user to operate a pump, a blower and a light up to 75 feet away. Models with a "T" suffix have a 24-hour digital, multiple program timer that turns a single or two-speed pump ON/OFF several times per day.