When your pool is winterized the pipes are protected by something called a "gizmo". This plug goes into the skimmer which stops water from getting into the pipes. Depending on the weather over the winter months, water will continue to accumulate in the pool and potentially raise high enough and go into the skimmer opening. But, don't worry! The gizmo serves more than just being a plug. It is also designed to take the expansion pressure created by any freezing.
"A gizmo is a long, hollow plastic tube that threads into the skimmer opening to prevent the skimmer from cracking in the cold winter weather. The gizmo is an ice compensator, which means that if water gets into your skimmer and freeze and ice expands, the gizmo will absorb the expansion (instead of the skimmer)."
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