Check the listing for details. Ultraviolet UV Light Bulb 12W for Water Sterilization System. Condition: New. Listed at 19.99 USD. < Ultraviolet UV Light Bulb 12W for Water Sterilization System Made by: Unit Price: $19.99 The specifications are as follows: 12W Ultraviolet Light Bulbs (UV-12W) – Kills harmful Bacteria, E Coli, Viruses Fungi, Algae and most microorganisms including cryptosporidium and giardia, and many other contaminants. No chemicals involved. Consistent performance. Sterilization effectiveness will not decrease over time. This light bulb is a replacement light bulb for UV water sterilization system. It has to be installed inside a transparent container that isolates it from water. The light bulb itself is not water proof. It can't touch water at any time. Product Features Capacity: 1 GPM Length: 11" UV lamp: 12W Voltage:110v UV Lamp Life: 9000 hours (about 1 year)