In many modern kitchens, this small cup is actually the refill port for a built-in soap dispenser.
It allows users to easily refill dish soap or hand soap without unscrewing the dispenser bottle underneath the sink.
Air Gap (For Dishwashers):
Alternatively, it might be an air gap for the dishwasher, a feature required in some regions to prevent contaminated water from backing up into clean water lines.
It is designed to improve water drainage and maintain hygiene.
How to Use It?
For Soap Dispensers:
Remove the cap or cover on the small cup.
Pour liquid soap directly into the port.
Avoid overfilling to prevent spills.
For Air Gaps:
Ensure the gap is clear of debris or blockages to maintain proper functionality.
If water spills out, it might indicate a clogged dishwasher drain that needs cleaning.
Why Is It Important?
Convenience:
For soap dispensers, it saves time and avoids the hassle of accessing the underside of the sink.
Health and Safety:
If it's an air gap, it ensures proper drainage, maintaining a sanitary kitchen environment.
Tips for Maintenance
Clean the port or air gap regularly to prevent buildup.
Use the appropriate soap for dispensers—dish soap for dishes and hand soap for handwashing.
Check the dishwasher’s drainage system if the air gap overflows.