Water tap, the one touch joint, and then the water supply hose.
If using for a many years, such as the packing of the hose, it may degrade over the years, and may result in water leaks, so regularly (at the time of use, etc.) check
that there are no leaks.
If in the unlikely case that there is a leak, close the water faucet and consult about an inspection/repair.
Drainage outlet
The guideline is to do this once a month, or the drying time will increase, and clean it if CO2 is displayed.
Prior to installing the machine, check that there is no thread debris in the drainage outlet.
Remove the drainage hose from the drainage outlet, and when reinserting, check that the terminal is properly inserted into the drainage into the drainage pipe.