The GeneralAire 7507 is the correct fill valve kit for the following humidifier models: GeneralAire DS20 GeneralAire RS20The GeneralAire 20-10 Humidifier Fill Valve Kit is a replacement fill valve
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99.52 GeneralAire 15-3 Humidifier Fill Valve Assembly
100.96 GeneralAire 35-3 Humidifier Fill Valve Assembly
240.92 GeneralAire 50-03 Humidifier Fill Valve Assembly
65.62 GeneralAire 20-5 Steam Humidifier Fill Cup
127.66 GeneralAire 50-22 Steam Humidifier Fill Cup