The Pentair 39104500 Clean and Clear Filters Union Nut C-Clip is an essential component for keeping your pool or spa's filtration system running smoothly and effectively. This 2-7/8"-diameter made to hold the union nut to the filter body, guaranteeing a snug and leak-proof fit. Because sturdy black plastic that won't corrode or wear out, it will function for a long time even in harsh ... https://www.usapoolshop.com/39104500-pentair-clean-and-clear-filters-union-nut-c-clip