Hayward D.E.CX5000F 1/2-Inch Bump Shaft Replacement for Hayward Perflex Extended-Cycle D.E. Filter Bump shaft replacement Fits hayward perflex extended-cycle d.e. filter models ec40ac, ec50ac, i_pfppts, ec50c80x5s and ec40c90, ec50c90 series Size 1/2-inch Weight 8.7-pound