IceGuards allow for water from Sump Pumps to exit via discharge lines. They provide extra protection in the event that discharge lines become clogged due to ice in freezing temperatures. The slotted openings allow for water to continue to be pumped from the basement, unobstructed. Once ice is able to melt in the discharge line, water will run down the discharge line as normal. The added peace-of-mind of having IceGuard gives a house further protection from a wet basement.