The UST-400 Sun-Pure Replacement Lamp is compatible with the UST-400 120V and UST-400 230V UV Systems. The 2-pin configuration is specific to the UST-400-BALLAST. For optimum efficiency in your UST-400 UV system, it is recommended to replace the UV lamp every 12 months. Exchanging old lamps ensures you are drinking the cleanest water possible.








