Polar Air Jet Nozzle (Polar #'s 022513, ZA3.022513, 022514, ZA3.022514, 010800, and 010807)
Size: 40mm (1.57") long, including the height of the protruding ball
This style was generally used in Polar cutters built after the mid 1960's and they press fit in 15 millimeter diameter reamed holes in the table.
Note: Picture shows two for clarity. Price is for one.