Superior Aqua Treatment UVC-ATS4-450, Superior UV Bulb for Aqua Treatment Services, 10000 Hours Effective hours rating: 10,000hrs - ultraviolet germicidal light bulb Base type: 4pins one end For use in models: DWS-8V ,EV-8E, SE-8V , SL-8V Bulb type: T5 style quartz glass