Hayward ECX5000G Diaphragm Gasket Replacement for Hayward Perflex Extended-Cycle D.E. Filter Diaphragm gasket replacement Fits hayward perflex extended-cycle d.e. filter models ec40ac, ec50ac, i_pfppts, ec50c80x5s and ec40c90, ec50c90 series Weight 4-1/2-pound