GPH436T5L Ultraviolet Sterilizer Bulb
GPH436T5L
Type: 17 1/4" BiPin Germicidal Lamp
Connection: Bi-pin both ends
This bulb might not necessarily be manufactured by your utraviolet system's manufacturer, but it functions correctly as a replacement for this system.
Manufacturers recommend changing your UV Sterilizer Bulb once a year.