< 25W UV Replacement Bulb 4 Prong for Water Purifier Ultraviolet Light Made by: Unit Price: $23.99 The specifications of the set are as follows: 25W Ultraviolet Light Bulbs(25W-UV) – Kills harmful Bacteria, E Coli, Viruses Fungi, Algae and most microorganisms including cryptosporidium and giardia, and many other contaminants. This bulb is replacement bulb for Ultraviolet Light Water Purifier Whole House UV Sterilizer 25W, 6 GPM Product Features Length: 21 5/8" UV lamp: 25W Voltage:110V & 220V Base: 4 Prongs UV Lamp Life: 9000 hours (about 1 year)