This popular single-ended UVC bulb fits the following filtration systems: All-in-Ones Fish Mate 5000 Bio Filter & PondXpert TripleAction 3000 (5m cable) Hozelock EasyClear 9000 PondXpert TripleAction 3000 Classic (5m cable) PondXpert TripleAction 3000 Classic (10m cable) PondXpert TripleAction 9000 Evolve Velda Floating Combi 2500 Filters Hozelock Bioforce 12000 (mid-2012 serial numbers 16 10 01 or higher) PondXpert SpinClean 6000 (Newer Model) PondXpert SpinClean 8000 PondXpert SpinClean 12000 PondXpert SpinClean Auto 8000 PondXpert SpinClean Auto 12000