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This single-ended UV bulb fits many popular filters such as the following*: All-in-OnesOase Filtral 9000PondXpert TripleAction 4500 EvolvePondXpert TripleAction 6000 Evolve FiltersHozelock Bioforce 8000Oase Filtoclear 6000Oase Filtoclear 11000Oase Filtoclear...