PURA UV-20#36002018 UV20 Water Treatment Germicidal UV Light Bulb 17.16" 10,000 Hours Effective Hours Rating: 12,000hrs - Ultraviolet Germicidal Light Bulb For Use in Models: UV-20, UV-20-1, UV203 UV20 UV20-1 UV20-2 UV20-3 Bulb Type: T5 Style Quartz Glass Base Type: 4pins ONE END Pura #36002018