Hayward D.E.CX9611246 O-ring Replacement for Hayward Perflex Filter and Duraniche O-ring replacement Fits hayward perflex extended-cycle basic and d.e. filter models ec65, ec65a, ec75, ec75a i_pfppts, ec50c80x5s and ec40, ec50 series Also fits hayward duraniche-gunite and concrete model sp0600u Weight 3.6-pound