Hayward ECX4077B1 Check Valve Replacement for Select Hayward Filter Check valve replacement Fits hayward perflex extended-cycle basic and d.e. filter models ec65a, ec75a, ec65, ec75, ec50a, ec30, ec40, ec40ac, ec50ac, i_pfppts, ec50c80x5s, ec40c90 Also fits hayward asl filter, regenx grid element d.e. filter and star-clear cartridge filter models c85075xes, c125080x5s, rg450, rg700 Weight 9.3-pound