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