Any water remaining in your outdoor kitchen’s plumbing system has the potential to freeze over, causing pipes to burst and costing you repair fees—and a significant hassle. To prevent this from happening, it’s important to properly winterize your outdoor sink, as well as any other appliances connected to water supply lines (such as refrigerators or ice makers).
First, turn off the water valves (these are likely located underneath the sink) to cut off your water supply. Once your water is off, turn on your sink’s faucet to drain any excess water. To clear any water left in the drain valves, you can use compressed carbon dioxide to clear water from the lines. As an added step, you can pour antifreeze down the drain to prevent any freezing. It’s also a good idea to cover your sink while its not in use to keep out any dirt or debris.