PondMaster 20W UV Clarifier # 12972 , 02920, PUV-2000 ,20 Watt UV Replacement Bulb Effective Hours Rating: 12,000hrs - Ultraviolet Germicidal Light Bulb Includes Free Gloves for Handling Length: approx: 14.5 Bulb Type: T5 Style Quartz Glass SPLIT BASE ON BOTTOM OF THE BULB -EXACT PART