Carefully insert the new aerator into the collar, making sure that the mesh end is facing downward. Push the aerator firmly into the collar to ensure a tight fit.

Place the aerator gasket on top of the aerator within the faucet collar. This will create a seal between the aerator and the faucet, preventing any water from leaking out.

Use your fingers to tighten the faucet collar and aerator onto the end of the faucet.