A skimmer sock protects your pump and filter from loose debris and helps to prevent clogging. Using a pool sock protects the pump impeller and shaft seal from damage and clogging, thereby extending the life of your pool filtration system while saving you time and money! Skimmer socks reduce maintenance by making cleaning skimmer pool baskets easier and less messy – best of all, these large skimmer socks fit most pool skimmer models!