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BSPEEDAIRE dovetail PNP switches are used in automated machinery to detect the position of a pneumatic cylinder, count piston cycles and change cylinder operation. These switches remain in normally open configuration, unless a signal is passed. They have an LED to indicate about the operation and can fit ports having bore diameters ranging from 3/4 to 4 inches. Choose between 1/2 and 9 feet lead lengths of these PNP switches, available on Raptor Supplies.