Coupling for System One humidifier

Hi

I saw there is something advertised as 'Respironics Remstar Heated Humidifier Couplings'. Does somebody knows if the Systme One has a coupling which needs to be replaced too? If yes how often and where do we get those?

When you take out the water tank (on the PR System One) you see there is a kind of coupling where the tank plugs inside the humidifier.

Thanks