Hayward ECX27091 Back Mount Pressure Gauge Replacement for Select Hayward Filter Back mount pressure gauge replacement Fits hayward star-clear and star-clear ii cartridge filter, regenx grid element d.e. filter and asl filter models rg450, rg700, c85075xes, c125080x5s Also fits hayward perflex series extended-cycle basic and d.e. filter models ec65, ec65a, ec75, ec75a, ec50a, ec50ac, i_pfppts