Fluval UVC In-Line Clarifier for canister filters. Fits 5/8 inch (16mm) internal diameter hosing. Works in fresh or saltwater aquariums up to 100 US gal / 400 L.
CCFL bulb, 30,000 hour lifespan, 3W. Includes a 4-24 hour programmable timer. Connects inline with external canister filter output.