3-way valves have a supply, outlet and exhaust port. When the toggle is in the "on" position, air flows from the inlet to the outlet and the exhaust port is blocked. Moving the toggle to the "off" position closes the inlet and opens the outlet to the exhaust port which vents the outlet to atmosphere.
I’m using a Clippard MTJV-3 with push to connect fittings that fit a 5mm nylon pneumatic line.
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