20 Watt UV Bulb for Aqua-Pro 6GPM 20W Sterilizer AquaPro UV-C Lamp Bulb Effective Hours Rating: 10,000hrs - Ultraviolet Germicidal Light Bulb Cross Reference: 20 Watt UV Bulb for Aqua-Pro 6GPM 20W Sterilizer Bulb Type: T5 Style Quartz Glass Base Type: 4pins ONE END, Approx 17" in Length