The glass barrel's rim has a little indentation where the silicone rubber cartridge stopper sits. You should throw away cartridges with rubber stoppers that are not slightly indented.
The three syringe varieties are Luer-Lok, Luer-Slip, and Luer-Taper. While Luer-Slip syringes lack this locking mechanism, Luer-Lok syringes have a locking mechanism that prevents the needle from coming off. A more accurate injection is made possible by the tapered tip of Luer-Taper syringes.
Retract the piston on the syringe 2. Insert the rubber stopper of the anesthetic cartridge first into the syringe. 3. Carefully press the harpoon into the rubber stopper.
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