Inside the metal tube is a standard sac with a flat metal pressure bar. Flip the switch and it bends the pressure bar to compress the sac. Flipping the switch back relieves the pressure and allows ink to be drawn in.
Inside the metal tube is a standard sac with a flat metal pressure bar. Flip the switch and it bends the pressure bar to compress the sac. Flipping the switch back relieves the pressure and allows ink to be drawn in.
