You have heard about winterizing your RV by blowing out the line with air. I do this every year in addition to adding antifreeze. However, many people just use the air. It’s especially helpful if you’re frequently using your RV in the winter and can save you a lot of money on RV antifreeze. There are numerous kits available for this, but I highly recommend getting one with a quick disconnect, just like this one. It makes connecting this to your freshwater lines a snap. Here’s a solid deal for a kit for the price of a couple of bottles of antifreeze.