Tom, most RV stores and Wal-Mart have a plastic part for about $1 that is
threaded to connect to your city water inlet with an air nipple so you can
blow out the water from the lines when it's time to winterize. I recommend
a water heater bypass kit and using the onboard water pump to pump RV
antifreeze through the system. There's a kit for that too. I can put
antifreeze in my Tradewind water lines with less that 2 gallons of
antifreeze. It's fast and freeze proof.
Jim Greene
' 68 Tradewind