My spray port is a bit different - how to winterize it?

If the port piping is part of the hot water line system flush antifreeze through it like any hot water faucet.

If it is on the other side of the water heater bypass and directly into the tank, you may need to blow it clear with air.

You do not want to get antifreeze in the water heater tank, a little goes a long ways when it comes to tasting it in the hot water system.

Good Luck