If it’s cold enough to freeze 7 inches below ground, you should empty the water from your Quick-Snap for the winter. You could remove the unit and plant it again in the spring. You could unscrew the top and wick out the water with a towel. Or, you can snap on an Air Purge and blow the water out with your bicycle pump. You stay clean and dry. The sprinkler unit stays in the ground without having its settings disturbed. The sprinkler unit stays dry all winter and is ready to go to work in the spring without further adjustment. The Air Purge will work with any clamp-on type of bicycle pump.