UV Germicidal Replacement Lamp 05-0176R 05-0176R Aqua-Pure Systems APUV-12, UVLB-1X, Biolite BIO12, UVLB-1X, Cuno APUV-12, UVLB-1X, Glasco GS4305L, Ideal Horizons 42012, Master Water HIMSV-20, Neptune (Water Treatment & Accessories) 5000, 5020, 5030, GPH810T5L/4. The lamp is 39 watts, 810 mm in length, rated effective life 10,000 hrs., change once a year.