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A skimmer guard absorbs the expansion of freezing water in your skimmer. The water crushes the skimmer guard instead of expanding out and destroying your skimmer, saving you from having to replace a pool skimmer when you open your pool.
Inground Threaded Winterizing Plug
Once you add antifreeze to your pool's plumbing lines, use the threaded winterizing plugs in all your skimmer and return lines for winter protection.