This popular single-ended replacement bulb for pond UV units and pond filters, including the following: All-in-Ones Blagdon Inpond 6000 Blagdon Inpond 9000 Hozelock Bioforce 5500 Hozelock EasyClear 6000 Laguna PowerClear Multi 3500 Laguna PowerClear Multi 7000 Oase Filtral 6000 PondXpert TripleAction 3000 Evolve PondXpert TripleAction 4000 Classic Filters Blagdon MiniPond 12000 Fish Mate 10000 Oase Filtoclear 3000 PondXpert EasyFilter 9000 PondXpert Filtobox 6000